fix(updater): add parent to dialog to fix issues in tilling WMs

QProgressDialog without parents in Qt tend to cause graphical issues on
some systems, so we add the main window as a parent here!

Signed-off-by: flow <flowlnlnln@gmail.com>

launcher/updater/PrismExternalUpdater.h

@@ -34,7 +34,7 @@ class PrismExternalUpdater : public ExternalUpdater {
     Q_OBJECT
 
    public:
-    PrismExternalUpdater(const QString& appDir, const QString& dataDir);
+    PrismExternalUpdater(QWidget* parent, const QString& appDir, const QString& dataDir);
     ~PrismExternalUpdater() override;
 
     /*!