little logic fix.

Use Scene and not type(self)

Author: Oliver Strait

manim/scene/scene.py

@@ -1621,7 +1621,7 @@ def scene_selection_callback(sender: Any, data: Any) -> None:
             config["scene_names"] = (dpg.get_value(sender),)
             self.queue.put(SceneInteractRerun("gui"))
 
-        scene_classes = scene_classes_for_gui(config.input_file, type(self))
+        scene_classes = scene_classes_for_gui(config.input_file, Scene)
         scene_names = [scene_class.__name__ for scene_class in scene_classes]
 
         with dpg.window(