Input: ALPS - unconditionally enable tapping mode

The condition in alps_init() was also inverted and the driver
was enabling tapping mode only if it was already enabled.

Signed-off-by: Peter Osterlund <petero2@telia.com>
Signed-off-by: Vojtech Pavlik <vojtech@suse.cz>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>