clutter/x11: detect tablet type from the Wacom property

The xf86-input-wacom driver exports a property with the tool type as known by
the driver. This is a more reliable choice than guessing based on the device
name.

In the touchscreen case, we simply use is_touch_device() to guess which one of
the two options it is. Note that this code should never be hit anyway as we
would've succeeded earlier with a previous is_touch_device() call.
2 jobs for <span class="ref-name">wip/tablet-device-type-from-wacom</span> in 18 minutes and 26 seconds (queued for 1 minute and 31 seconds)
Status Job ID Name Coverage
  Build
passed #162176
build-mutter

00:05:10

 
  Test
passed #162177
test-mutter

00:13:16