fix(corefile): Close files of broken file transfers

Fix #6500

src/core/corefile.cpp

@@ -553,5 +553,6 @@ void CoreFile::onConnectionStatusChanged(uint32_t friendId, Status::Status state
             continue;
         fileMap[key].status = status;
         emit fileTransferBrokenUnbroken(fileMap[key], isOffline);
+        removeFile(friendId, fileMap[key].fileNum);
     }
 }