fix(propagation): ensure we delete pending folders before terminating

we might forget to run the pending folder deletions when terminating
synchronization

ensure we check if any of them are to be done

Signed-off-by: Matthieu Gallien <matthieu.gallien@nextcloud.com>

src/libsync/owncloudpropagator.cpp

@@ -1611,6 +1611,11 @@ void PropagateRootDirectory::slotSubJobsFinished(SyncFileItem::Status status)
         return;
     }
 
+    if (!_dirDeletionJobs._jobsToDo.empty()) {
+        _dirDeletionJobs.scheduleSelfOrChild();
+        return;
+    }
+
     if (status != SyncFileItem::Success
         && status != SyncFileItem::Restoration
         && status != SyncFileItem::BlacklistedError