chore: remove dropped deprecated method call for share manager

[juliusknorr]

Fix failing requests and CI jobs around direct editing due to removal of a deprecated method in server

{
  "reqId": "KKHotlHF7Kjx7WNHUwSD",
  "level": 3,
  "time": "2025-05-19T10:55:50+00:00",
  "remoteAddr": "10.1.0.254",
  "user": "--",
  "app": "index",
  "method": "GET",
  "url": "/index.php/apps/richdocuments/direct/EEc28MPVBCvm6ZVEffl1AuS2LAmufo3ytXg2MrjuBD69m7bH1hBMQXEUsJRiqXYv",
  "message": "Call to undefined method OC\\Server::getShareManager() in file '/home/runner/work/richdocuments/richdocuments/apps/richdocuments/lib/Controller/DirectViewController.php' line 136",
  "userAgent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Cypress/13.17.0 Chrome/118.0.5993.159 Electron/27.3.10 Safari/537.36",
  "version": "32.0.0.0",
  "exception": {
    "Exception": "Exception",
    "Message": "Call to undefined method OC\\Server::getShareManager() in file '/home/runner/work/richdocuments/richdocuments/apps/richdocuments/lib/Controller/DirectViewController.php' line 136",
    "Code": 0,
    "Trace": [
      {
        "file": "/home/runner/work/richdocuments/richdocuments/lib/private/AppFramework/App.php",
        "line": 161,
        "function": "dispatch",
        "class": "OC\\AppFramework\\Http\\Dispatcher",
        "type": "->"
      },
      {
        "file": "/home/runner/work/richdocuments/richdocuments/lib/private/Route/Router.php",
        "line": 313,
        "function": "main",
        "class": "OC\\AppFramework\\App",
        "type": "::"
      },
      {
        "file": "/home/runner/work/richdocuments/richdocuments/lib/base.php",
        "line": 1062,
        "function": "match",
        "class": "OC\\Route\\Router",
        "type": "->"
      },
      {
        "file": "/home/runner/work/richdocuments/richdocuments/index.php",
        "line": 25,
        "function": "handleRequest",
        "class": "OC",
        "type": "::"
      }
    ],
    "File": "/home/runner/work/richdocuments/richdocuments/lib/private/AppFramework/Http/Dispatcher.php",
    "Line": 148,
    "Previous": {
      "Exception": "Error",
      "Message": "Call to undefined method OC\\Server::getShareManager()",
      "Code": 0,
      "Trace": [
        {
          "file": "/home/runner/work/richdocuments/richdocuments/apps/richdocuments/lib/Controller/DirectViewController.php",
          "line": 74,
          "function": "showPublicShare",
          "class": "OCA\\Richdocuments\\Controller\\DirectViewController",
          "type": "->"
        },
        {
          "file": "/home/runner/work/richdocuments/richdocuments/lib/private/AppFramework/Http/Dispatcher.php",
          "line": 202,
          "function": "show",
          "class": "OCA\\Richdocuments\\Controller\\DirectViewController",
          "type": "->"
        },
        {
          "file": "/home/runner/work/richdocuments/richdocuments/lib/private/AppFramework/Http/Dispatcher.php",
          "line": 116,
          "function": "executeController",
          "class": "OC\\AppFramework\\Http\\Dispatcher",
          "type": "->"
        },
        {
          "file": "/home/runner/work/richdocuments/richdocuments/lib/private/AppFramework/App.php",
          "line": 161,
          "function": "dispatch",
          "class": "OC\\AppFramework\\Http\\Dispatcher",
          "type": "->"
        },
        {
          "file": "/home/runner/work/richdocuments/richdocuments/lib/private/Route/Router.php",
          "line": 313,
          "function": "main",
          "class": "OC\\AppFramework\\App",
          "type": "::"
        },
        {
          "file": "/home/runner/work/richdocuments/richdocuments/lib/base.php",
          "line": 1062,
          "function": "match",
          "class": "OC\\Route\\Router",
          "type": "->"
        },
        {
          "file": "/home/runner/work/richdocuments/richdocuments/index.php",
          "line": 25,
          "function": "handleRequest",
          "class": "OC",
          "type": "::"
        }
      ],
      "File": "/home/runner/work/richdocuments/richdocuments/apps/richdocuments/lib/Controller/DirectViewController.php",
      "Line": 136
    },
    "message": "Call to undefined method OC\\Server::getShareManager() in file '/home/runner/work/richdocuments/richdocuments/apps/richdocuments/lib/Controller/DirectViewController.php' line 136",
    "exception": {},
    "CustomMessage": "Call to undefined method OC\\Server::getShareManager() in file '/home/runner/work/richdocuments/richdocuments/apps/richdocuments/lib/Controller/DirectViewController.php' line 136"
  }
}