server: add a test for touch events on a disabled device
server: add a test for touch events on a disabled device

Triggered by https://bugs.freedesktop.org/show_bug.cgi?id=81781, but that
turned out to be a kernel bug.

Signed-off-by: Peter Hutterer <b9c50af7afa7642f6f854434cda9ffe54ece8b85@who-t.net>

freedesktop-unofficial-mirror/xorg__test__xorg-integration-tests,freedesktop-unofficial-mirror/xorg__test__xorg-integration-tests,freedesktop-unofficial-mirror/xorg__test__xorg-integration-tests