Disable processing events when adding torrents. Closes #7436.

webUI connection timeout & deletion might occur while
doing processEvents() and will result in use-after-free segfault.

src/base/bittorrent/session.cpp

@@ -2217,8 +2217,6 @@ bool Session::findIncompleteFiles(TorrentInfo &torrentInfo, QString &savePath) c
                 found = true;
                 torrentInfo.renameFile(i, filePath + QB_EXT);
             }
-            if ((i % 100) == 0)
-                qApp->processEvents(QEventLoop::ExcludeUserInputEvents);
         }
 
         return found;