Prevent non-evdev devices from firing the eventcomm AutoDevProbe callback.

--- a/conf/50-synaptics.conf
+++ b/conf/50-synaptics.conf
@@ -2,4 +2,5 @@ Section "InputClass"
         Identifier "touchpad catchall"
         Driver "synaptics"
         MatchIsTouchpad "on"
+        MatchDevicePath "/dev/input/event*"
 EndSection
