Controller bugfixes in profile select (#8716)

* Controller bugfixes in profile select, closes #8265

2 fixes for using a controller in profile select dialog.

Pressing 'B' cancels the launch of the game
Using controller to select a profile now correctly sets the index to use for the launch

* Added brackets to if statements as requested.

src/yuzu/main.h

@@ -218,7 +218,7 @@ private:
     void SetDiscordEnabled(bool state);
     void LoadAmiibo(const QString& filename);
 
-    void SelectAndSetCurrentUser();
+    bool SelectAndSetCurrentUser();
 
     /**
      * Stores the filename in the recently loaded files list.