HID: huion: Don't ignore other interfaces

Don't ignore non pen-reporting interfaces as they may be used by some
models reusing the same product ID.

Signed-off-by: Nikolai Kondrashov <spbnick@gmail.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>