Input: Fix Palm Rejection

A "bad merge" appears to have broken 'Palm Rejection' for devices
that use a stylus. This commit:

https://gerrit.slimroms.net/#/c/62/

appears to have only implemented half of the necessary changes in
InputReader.cpp for 'Palm Rejection' to work properly. This commit
adds in the missing pieces.

PS2: whitespace derp

Change-Id: I402df6ed45b53cf02299f0b6588c763c3cb3de48