Fix missing "Add torrent file" icon

src/mainwindow.cpp

@@ -108,10 +108,12 @@ MainWindow::MainWindow(QWidget *parent, const QStringList& torrentCmdLine) : QMa
 #if defined(Q_WS_X11)
   if (Preferences().useSystemIconTheme())
     setWindowIcon(QIcon::fromTheme("qbittorrent", QIcon(QString::fromUtf8(":/Icons/skin/qbittorrent32.png"))));
-  else
+  else {
 #else
     setWindowIcon(QIcon(QString::fromUtf8(":/Icons/skin/qbittorrent32.png")));
 #endif
+  }
+
   actionOpen->setIcon(IconProvider::instance()->getIcon("list-add"));
   actionDownload_from_URL->setIcon(IconProvider::instance()->getIcon("insert-link"));
   actionSet_upload_limit->setIcon(QIcon(QString::fromUtf8(":/Icons/skin/seeding.png")));