Rename 'visitedAddBookmark' arg to a less confusing name

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

@@ -69,7 +69,7 @@ class AddBookmarkFolderFragment : Fragment(R.layout.fragment_edit_bookmark) {
                     R.id.bookmarkAddFolderFragment,
                     AddBookmarkFolderFragmentDirections
                         .actionBookmarkAddFolderFragmentToBookmarkSelectFolderFragment(
-                            true
+                            allowCreatingNewFolder = true
                         )
                 )
             }

app/src/main/java/org/mozilla/fenix/library/bookmarks/edit/EditBookmarkFragment.kt

@@ -106,7 +106,9 @@ class EditBookmarkFragment : Fragment(R.layout.fragment_edit_bookmark) {
                     nav(
                         R.id.bookmarkEditFragment,
                         EditBookmarkFragmentDirections
-                            .actionBookmarkEditFragmentToBookmarkSelectFolderFragment()
+                            .actionBookmarkEditFragmentToBookmarkSelectFolderFragment(
+                                allowCreatingNewFolder = false
+                            )
                     )
                 }
             }

app/src/main/java/org/mozilla/fenix/library/bookmarks/selectfolder/SelectBookmarkFolderFragment.kt

@@ -65,7 +65,7 @@ class SelectBookmarkFolderFragment : Fragment() {
 
     override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
         val args: SelectBookmarkFolderFragmentArgs by navArgs()
-        if (!args.visitedAddBookmark) {
+        if (!args.allowCreatingNewFolder) {
             inflater.inflate(R.menu.bookmarks_select_folder, menu)
         }
     }

app/src/main/res/navigation/nav_graph.xml

@@ -305,7 +305,7 @@
             android:id="@+id/action_bookmarkSelectFolderFragment_to_bookmarkAddFolderFragment"
             app:destination="@id/bookmarkAddFolderFragment" />
         <argument
-            android:name="visitedAddBookmark"
+            android:name="allowCreatingNewFolder"
             android:defaultValue="false"
             app:argType="boolean" />
     </fragment>