Remove redundant suffix from TorrentHandle class

Originally, it was just a wrapper for libtorrent::torrent_handle class, so it mimicked its name.
It was then transformed into a more complex aggregate, but the name was retained (just by inertia).
Unlike libtorrent::torrent_handle class in whose name "handle" means the pattern used,
it does not matter for qBittorrent classes and just eats up space in the source code.

src/gui/torrentoptionsdialog.h

@@ -35,7 +35,7 @@
 namespace BitTorrent
 {
     class InfoHash;
-    class TorrentHandle;
+    class Torrent;
 }
 
 namespace Ui
@@ -49,7 +49,7 @@ class TorrentOptionsDialog final : public QDialog
     Q_DISABLE_COPY(TorrentOptionsDialog)
 
 public:
-    explicit TorrentOptionsDialog(QWidget *parent, const QVector<BitTorrent::TorrentHandle *> &torrents);
+    explicit TorrentOptionsDialog(QWidget *parent, const QVector<BitTorrent::Torrent *> &torrents);
     ~TorrentOptionsDialog() override;
 
 public slots: