remove duplicated code

packages/app/src/components/PageEditor.tsx

@@ -135,9 +135,7 @@ const PageEditor = React.memo((): JSX.Element => {
 
     await save(opts);
     mutateEditorMode(EditorMode.View);
-    // disable unsaved warning
-    mutateIsEnabledUnsavedWarning(false);
-  }, [editorMode, save, mutateEditorMode, mutateIsEnabledUnsavedWarning]);
+  }, [editorMode, save, mutateEditorMode]);
 
   const saveWithShortcut = useCallback(async() => {
     if (editorMode !== EditorMode.Editor) {