fix: update pull/changed and diff/with-details local configs to match mock API

Local in/ configs had '#password': '' which differs from the mock API fixture
that now serves KBC::ProjectSecureKV::eJw=. This caused pull to report a
spurious configuration change and diff to show an unexpected #password diff.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Matovidlo

test/cli/diff/with-details/in/bar/extractor/keboola.ex-db-mysql/with-rows/config.json

@@ -4,7 +4,7 @@
       "host": "mysql.example.com",
       "port": 3306,
       "user": "root",
-      "#password": ""
+      "#password": "KBC::ProjectSecureKV::eJw="
     }
   }
 }

test/cli/pull/changed/in/bar/extractor/keboola.ex-db-mysql/with-rows/config.json

@@ -4,7 +4,7 @@
       "host": "mysql.example.com",
       "port": 3306,
       "user": "root",
-      "#password": ""
+      "#password": "KBC::ProjectSecureKV::eJw="
     }
   }
 }