HID: wacom: Update maximum X/Y accounding to outbound offset

Defined outbound offset for DTU and Cintiq. But didn't update
the relevant maximum values. Oops...

Signed-off-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
1 file changed