GBA: Support Game Boy Player rumble in the UI

[Screwtapello]

Currently, higan-ui has separate "Game Boy Advance" and "Game Boy Player" options. The difference is that the Game Boy Player defaults "inter-frame blending" to false instead of true, and it adds a "Rumble" node to settings.bml. Unfortunately, that Rumble node isn't exposed in the UI, so you can't indicate which physical controller should rumble when the emulated game asks for it.