Update mouse cursor shape after changes

This fixes some cases where the mouse cursor shape did not change automatically, but instead required a MouseMove to update.

scene/main/scene_tree.cpp

@@ -1087,6 +1087,7 @@ void SceneTree::_change_scene(Node *p_to) {
 	if (p_to) {
 		current_scene = p_to;
 		root->add_child(p_to);
+		root->update_mouse_cursor_shape();
 	}
 }