Fix inverted circular scrolling direction
Fix inverted circular scrolling direction

Introduced in 26831a6eeac6762ad4d99532f62ebbab0827de10.
In said commit, the old-style button events were changed to delta
accumulation. Alas, for circular scrolling, a positive delta is up whereas
for everything else a positive delta is down.

Reported-by: Thomas Bächler <5f50a84c1fa3bcff146405017f36aec1a10a9e38@archlinux.org>
Tested-by: Thomas Bächler <5f50a84c1fa3bcff146405017f36aec1a10a9e38@archlinux.org>
Signed-off-by: Peter Hutterer <b9c50af7afa7642f6f854434cda9ffe54ece8b85@who-t.net>
Reviewed-by: Chase Douglas <69e02ec421aa70a149511825d897f2549ceee9a2@canonical.com>

nanderson94/xf86-input-synaptics,felipejfc/xserver-xorg-input-synaptics,philipn/xserver-xorg-input-synaptics,felipejfc/xserver-xorg-input-synaptics,ssaavedra/xf86-input-synaptics,RsrchBoy/xserver-xorg-input-synaptics,mmonaco/xf86-input-synaptics,sencer/synaptics,eyko/xf86-input-synaptics,quadpixels/three-finger-dragging,eyko/xf86-input-synaptics,corcoran/xserver-xorg-input-synaptics,Lyude/xf86-input-synaptics,jiixyj/xf86-input-synaptics,ssaavedra/xf86-input-synaptics,gdestuynder/xf86-input-synaptics,mmonaco/xf86-input-synaptics,quadpixels/three-finger-dragging,mortehu/xf86-input-synaptics,corcoran/xserver-xorg-input-synaptics,felipejfc/xserver-xorg-input-synaptics,RsrchBoy/xserver-xorg-input-synaptics,philipn/xserver-xorg-input-synaptics,jiixyj/xf86-input-synaptics,Lyude/xf86-input-synaptics,mortehu/xf86-input-synaptics,gdestuynder/xf86-input-synaptics,sencer/synaptics,philipn/xserver-xorg-input-synaptics,nanderson94/xf86-input-synaptics