Spreadsheet: Propagate errors from SpreadsheetWidget::initialize_menubar

Author: https://github.com/AtkinsSJ
Commit: b746d324cf
Pull-request: https://github.com/SerenityOS/serenity/pull/18165
Reviewed-by: https://github.com/alimpfard ✅

Userland/Applications/Spreadsheet/SpreadsheetWidget.h

@@ -45,7 +45,7 @@ public:
         return current_view()->cursor();
     }
 
-    void initialize_menubar(GUI::Window&);
+    ErrorOr<void> initialize_menubar(GUI::Window&);
 
     void undo();
     void redo();