ref!: remove non-standard "userscript" export

Author: Sv443

package.json

@@ -11,8 +11,7 @@
       "browser": "./dist/UserUtils.mjs",
       "types": "./dist/lib/index.d.ts",
       "require": "./dist/UserUtils.cjs",
-      "import": "./dist/UserUtils.mjs",
-      "userscript": "./dist/UserUtils.user.js"
+      "import": "./dist/UserUtils.mjs"
     }
   },
   "type": "module",