touchpad: fix the number of button clicks in multitap

tap-tap-down-move should emit 1 click + press, not 2 clicks + press

https://bugs.freedesktop.org/show_bug.cgi?id=92016

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
(cherry picked from commit d92ae62dad53afd894aec3c47081780ef3d9b4d2)