Add optional parameter to _on_settings_changed()

src/cthulhu/plugin_system_manager.py

@@ -184,7 +184,7 @@ class PluginSystemManager:
                 logger.info(f"Adding binding: {binding.keysymstring} with modifiers {binding.modifiers}")
                 active_script.getKeyBindings().add(binding)
 
-    def _on_settings_changed(self):
+    def _on_settings_changed(self, app=None):
         """Re-register all plugin keybindings when settings change."""
         if not hasattr(self, '_plugin_global_bindings'):
             return