Input: wacom - do not send 2FGT Tablet PC events in TAP format

2FGT Tablet PC touch events were processed in _TAP_ format. Remove
them so we can change to _MT_ format.

Signed-off-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>