error: Make the error code as the title text of the OverlayDialog

Co-authored-by: Its-Rei <kupfel@gmail.com>

src/yuzu/applets/error.h

@@ -24,7 +24,7 @@ public:
                              std::function<void()> finished) const override;
 
 signals:
-    void MainWindowDisplayError(QString error) const;
+    void MainWindowDisplayError(QString error_code, QString error_text) const;
 
 private:
     void MainWindowFinishedError();