wacom: Skip GSD_WACOM_SET_ALL_MONITORS on the switch monitor pad action

Having an intermediate setting where the tablet is mapped to all monitors
comes up as a bit unintuitive, especially on 2 monitor setups, where one
click is required to switch to the other monitor, but then 2 clicks are
required to switch back.

https://bugzilla.gnome.org/show_bug.cgi?id=710373
wacom: separate LED/OLED setup to a separate function

There could be situations where calling this without updating
button mappings is desired.