message: Fix use of deprecated QApplication::desktop()
diff: #include <QLabel>
  #include <QNetworkAccessManager>
  #include <QNetworkReply>
  +#include <QScreen>
  #include <QSslSocket>
  #include <QString>
  #include <QUrlQuery>
  @@ -207,7 +208,7 @@ void CrashDialog::resizeEvent(QResizeEvent *)
  }
  void CrashDialog::recentre()
  {
  - QRect scr = QApplication::desktop()->screenGeometry();
  + QRect scr = QApplication::primaryScreen()->geometry();
  move(scr.center() - rect().center());
  // when we're first shown, on this stage, move the cursor
  