mako: touch: fix the tool type to finger

The tool type checking for pen was incorrect.

Sometimes finger touch produces the same condition as PEN which is
width major and minor are all zero.
This wrong detection change the tracking ID, resulting in two finger
touch report even when single touch is used.

Fix the tool type to finger since mako will support only finger.

Change-Id: I4c7631b77fed677d27d430986d70407af3406aca
1 file changed