project configuration: improve 'Convert to Repository Library' action

Hide 'Synchronize' actions in 'Library Diff' dialog (it makes no sense because content of a repository library cannot be modified).

java/idea-ui/src/com/intellij/openapi/roots/ui/configuration/projectRoot/LibraryJarsDiffDialog.kt

@@ -48,7 +48,10 @@ class LibraryJarsDiffDialog(libraryFile: VirtualFile,
     setOKButtonText("Replace")
     val request: ContentDiffRequest = DiffRequestFactory.getInstance().createFromFiles(project, libraryFile, downloadedFile)
     panel = DiffManager.getInstance().createRequestPanel(project, disposable, window)
-    panel.putContextHints(DirDiffSettings.KEY, DirDiffSettings().apply { enableChoosers = false })
+    panel.putContextHints(DirDiffSettings.KEY, DirDiffSettings().apply {
+      enableChoosers = false
+      enableOperations = false
+    })
     panel.setRequest(request)
     init()
   }