HID: hid-multitouch: Rename MT_CLS_DUAL1 and MT_CLS_DUAL2

This patch renames MT_CLS_DUAL1 to MT_CLS_DUAL_INRANGE_CONTACTID
and MT_CLS_DUAL2 to MT_CLS_DUAL_INRANGE_CONTACTNUMBER for better
readability.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@enac.fr>
Reviewed-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>