Drop edge speed from get_delta
Drop edge speed from get_delta

Always 0 anyway, and the feature was purged in
xf86-input-synaptics-1.6.0-8-g54f65f3

Signed-off-by: Peter Hutterer <b9c50af7afa7642f6f854434cda9ffe54ece8b85@who-t.net>

mad-s/xf86-input-synaptics-absolute,mad-s/xf86-input-synaptics-absolute