Controls image should tell how to close the menu

[Trodek]

• Description: The controls image doesn't specify the button that should be press to close the controls menu.

• Severity: C: Gameplay/art issues but don't prevent you from playing

• Steps to reproduce: Start the campaign or training mode

• Screenshot:

[dafral]

Eirini is working on it. She is not asigned because she is not in the github project.