backend: Reset current device id when current device removed

Bluetooth mouse usually goes in sleep state after a timeout, when that
happen the mouse is disconnected and on_device_removed function is
called. Before the patch if a touch device is available the
on_device_removed function hide the cursor. The issue is that the cursor
does not reappear once the bluetooth mouse is reconnected because
MetaBackend::current_device_id is not invalidated when on_device_removed
was called.

The patch set MetaBackend::current_device_id to 0 if the current device
is removed. This will make update_last_device to be triggered as soon as
another input device is used or the bluetooth mouse reconnect, as
consequence that the cursor reappear. The id 0 is never given to devices
and can safely used as undefine id.

https://bugzilla.gnome.org/show_bug.cgi?id=761067

src/backends/meta-backend.c

@@ -337,6 +337,8 @@ on_device_removed (ClutterDeviceManager *device_manager,
       gboolean has_touchscreen, has_pointing_device;
       ClutterInputDeviceType device_type;
 
+      priv->current_device_id = 0;
+
       device_type = clutter_input_device_get_device_type (device);
       has_touchscreen = check_has_slave_touchscreen (device_manager);