Don't update mouse cursor state on child order changed

Partially Revert "Create a virtual mouse move event after moving child nodes"
This reverts parts of commit ce10ca69794900896a4162efc823386ce5bde3dd.

The problem was that the the mouse-move event interacted in unexpected ways.

scene/main/node.cpp

@@ -216,14 +216,6 @@ void Node::_notification(int p_notification) {
 				memdelete(child);
 			}
 		} break;
-
-		case NOTIFICATION_CHILD_ORDER_CHANGED: {
-			// The order, in which canvas items are drawn gets rearranged.
-			// This makes it necessary to update mouse cursor and send according mouse_enter/mouse_exit signals for Control nodes.
-			if (get_viewport()) {
-				get_viewport()->update_mouse_cursor_state();
-			}
-		} break;
 	}
 }