Fix crash when aborting a torrent creation process. Closes #7783.

The wait time wasn't long enough causing the thread to
terminate prematurely.
Also, to avoid crashing qbt entirely when creating a torrent for a very
big file, I decided to wait indefinitely here.

src/base/bittorrent/torrentcreatorthread.cpp

@@ -67,7 +67,7 @@ TorrentCreatorThread::TorrentCreatorThread(QObject *parent)
 TorrentCreatorThread::~TorrentCreatorThread()
 {
     requestInterruption();
-    wait(1000);
+    wait();
 }
 
 void TorrentCreatorThread::create(const QString &inputPath, const QString &savePath, const QStringList &trackers,