Revert "Don't count BTN_TOUCH as tool. (#29428)"

Synaptics devices send garbage between BTN_TOUCH and BTN_TOOL_FINGER. By
switching to use this as proximity data now, the pointer is reset to the
garbage data position (usually around 1/5855).

This reverts commit 899218e181.

Reported-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Chris Bagwell <chris@cnpbagwell.com>

src/evdev.c

@@ -679,6 +679,7 @@ EvdevProcessKeyEvent(InputInfoPtr pInfo, struct input_event *ev)
 
     switch (ev->code) {
         case BTN_TOUCH:
+            pEvdev->in_proximity = value ? ev->code : 0;
             if (!(pEvdev->flags & (EVDEV_TOUCHSCREEN | EVDEV_TABLET)))
                 break;
             /* Treat BTN_TOUCH from devices that only have BTN_TOUCH as