SyncEngine: Set isDirectory before syncItemDiscovered

src/libsync/syncengine.cpp

@@ -525,6 +525,7 @@ int SyncEngine::treewalkFile( TREE_WALK_FILE *file, bool remote )
                 item->_isDirectory = isDirectory;
                 _syncItemMap.insert(key, item);
             }
+            item->_isDirectory = isDirectory;
             emit syncItemDiscovered(*item);
             return re;
         }