(fix) re-enable drag'n'drop in tracks view

Author: ronso0

src/widget/wtracktableview.cpp

@@ -720,7 +720,7 @@ void WTrackTableView::dragEnterEvent(QDragEnterEvent * event) {
 // Without it, the following drop is ignored.
 void WTrackTableView::dragMoveEvent(QDragMoveEvent * event) {
     auto* pTrackModel = getTrackModel();
-    if (!pTrackModel || pTrackModel->isLocked() || event->mimeData()->hasUrls()) {
+    if (!pTrackModel || pTrackModel->isLocked() || !event->mimeData()->hasUrls()) {
         event->ignore();
         return;
     }