Menu: sort game_cards alphabetically as a preset

[b7g]

Description

The game cards are now sorted alphabetically when the scene is ready, to match the OptionButton.

Type of change

• [x] Bug fix (non breaking change that fixes an issue)

Testing

yes

Checklist

• [x] My code follows the general style guidelines of the project
• [x] I have perfomed a self-review of my code
• [x] I have commented my code, particulary where it is unclear
• [x] My changes generate no new warnings or errors
• [x] The project compiles and runs correctly