Replace button14 with button12 for minigame state

A solution for #2200

Use button12 instead of button14 for minigame state. This only changes the internal slot and should not affect functionality. Please test first before approving.

Reasoning: Button 14 was chosen randomly, whereas 12 is actually the first button not yet taken up. Apart from this being cleaner and more orderly and logical, it allows buttons 13 14 15 and 16 to remain a free group: My mod Vore Tournament uses them, and the unexpected usage of button 14 for blocking movement currently breaks it. Ideally those last four buttons can be officially reserved for mods, granted they're the only way a mod can use custom keys for its own functionality.