Don't update CSG Shape when not inside tree

(cherry picked from commit 07042b40440a3af90539ddc5c7a8fcb0a178074e)

modules/csg/csg_shape.cpp

@@ -273,7 +273,7 @@ void CSGShape::mikktSetTSpaceDefault(const SMikkTSpaceContext *pContext, const f
 }
 
 void CSGShape::_update_shape() {
-	if (parent) {
+	if (parent || !is_inside_tree()) {
 		return;
 	}