Fixes #1496: Crash adding bookmark folder

app/src/main/java/org/mozilla/fenix/library/bookmarks/addfolder/AddBookmarkFolderFragment.kt

@@ -59,13 +59,18 @@ class AddBookmarkFolderFragment : Fragment(), CoroutineScope {
         launch(IO) {
             sharedViewModel.selectedFolder = sharedViewModel.selectedFolder
                 ?: requireComponents.core.bookmarksStorage.getTree(BookmarkRoot.Mobile.id)
+            launch(Main) {
                 bookmark_add_folder_parent_selector.text = sharedViewModel.selectedFolder!!.title
                 bookmark_add_folder_parent_selector.setOnClickListener {
                     Navigation.findNavController(requireActivity(), R.id.container)
                         .navigate(
                             AddBookmarkFolderFragmentDirections
-                            .actionBookmarkAddFolderFragmentToBookmarkSelectFolderFragment(BookmarkRoot.Root.id, true)
+                                .actionBookmarkAddFolderFragmentToBookmarkSelectFolderFragment(
+                                    BookmarkRoot.Root.id,
+                                    true
                                 )
+                        )
+                }
             }
         }
     }