Qt: Add Game Properties to view menu (for running game)

src/duckstation-qt/mainwindow.h

@@ -69,6 +69,7 @@ private Q_SLOTS:
   void onViewGameListActionTriggered();
   void onViewGameGridActionTriggered();
   void onViewSystemDisplayTriggered();
+  void onViewGamePropertiesActionTriggered();
   void onGitHubRepositoryActionTriggered();
   void onIssueTrackerActionTriggered();
   void onDiscordServerActionTriggered();