Disable PIN entry after successful quick unlock

Small polish: I still often press the enter button out of muscle memory
when entering my PIN code, which leads to an "invalid PIN" message being
shown for a tiny moment as the screen unlocks. Disable the entry view
after a quick unlock to fix this.

Change-Id: I1f24a41a20d36e4b6864fffbae8ad0b80ce52393
1 file changed