evdev: Stop looking for pointer buttons when we get to BTN_JOYSTICK
evdev: Stop looking for pointer buttons when we get to BTN_JOYSTICK

We don't want to mark a touchscreen as a button device just because it
exposes the BTN_TOUCH and BTN_TOOL buttons.

Gnurou/weston,udoprog/weston,mchalupa/weston,udoprog/weston,Gnurou/weston,kwm81/weston,Fantu/compositor-spice,Fantu/compositor-spice,kwm81/weston,sir-murray/weston,xorgy/weston,jonnylamb/weston,xorgy/weston,eyolfson/weston,krezovic/weston,mchalupa/weston,sir-murray/weston,giucam/weston,giucam/weston,Tarnyko/weston-xdg_surface_present,Tarnyko/weston-xdg_surface_present,krezovic/weston,Fantu/compositor-spice,jonnylamb/weston,eyolfson/weston