x11: More fake tablet blacklisting

Sigh.

Now that we've neutered the QEMU USB tablet, I'm finding that
spice is doing just the same nonsense. It has a fake "spice vdagent
tablet". Blacklist that as well.

gdk/x11/gdkdevicemanager-xi2.c

@@ -429,6 +429,7 @@ create_device (GdkDeviceManager *device_manager,
       else if (!strstr (tmp_name, "mouse") &&
                !strstr (tmp_name, "pointer") &&
                !strstr (tmp_name, "qemu usb tablet") &&
+               !strstr (tmp_name, "spice vdagent tablet") &&
                has_abs_axes (display, dev->classes, dev->num_classes))
         input_source = GDK_SOURCE_TOUCHSCREEN;
       else