allow tilt attacks with mod x

[colonket]

In Rivals of Aether mode, holding Mod X now checks if A button is being pressed so that it can change direction values to allow for tilt attacks with Mod X.

I used the values for Mod Y's horizontal and verticals since that works for tilt attacks, but feel free to adjust the values if the chosen values cause issues in other areas.

[Alto-27]

Code works fine and doesn't break anything in terms of controls or in game as far as I can tell. I'd say the PR is good