The GameCube controller has a different face button layout than the Xbox or Nintendo Switch style controllers. It has the B button on the left and the X button on the right, so we should map those to SDL_GAMEPAD_BUTTON_WEST with SDL_GAMEPAD_BUTTON_LABEL_B and SDL_GAMEPAD_BUTTON_EAST with SDL_GAMEPAD_BUTTON_LABEL_X respectively.
Fixes https://github.com/libsdl-org/SDL/issues/12847
