Fix #135643: Node ungroup operator doesn't move frame nodes

Caused by 4bf34d9591.

Nodes within frames were ignored because previously their location was
relative to the frame, so moving both the frame and the node would cause
"double" movement. Now each node location is independent.

source/blender/editors/space_node/node_group.cc

@@ -320,10 +320,8 @@ static void node_group_ungroup(Main *bmain, bNodeTree *ntree, bNode *gnode)
                   animation_basepath_change_new(*old_animation_basepath, *new_animation_basepath));
     }
 
-    if (!node->parent) {
-      node->location[0] += gnode->location[0];
-      node->location[1] += gnode->location[1];
-    }
+    node->location[0] += gnode->location[0];
+    node->location[1] += gnode->location[1];
 
     node->flag |= NODE_SELECT;
   }