updated add_context_pane settings use (#796)

gef.py

@@ -10570,8 +10570,7 @@ def add_context_pane(self, pane_name: str, display_pane_function: Callable, pane
 
         # assure users can toggle the new context
         corrected_settings_name = pane_name.replace(" ", "_")
-        layout_settings = context.get_setting("layout")
-        context.update_setting("layout", f"{layout_settings} {corrected_settings_name}")
+        gef.config["context.layout"] += f" {corrected_settings_name}"
 
         # overload the printing of pane title
         context.layout_mapping[corrected_settings_name] = (display_pane_function, pane_title_function)