strings: Update ART warning message

Message was confusing many users into thinking the ROM does not work with ART.
Modified res/values/pa_strings.xml to clarify that the team does not support ART.

Change-Id: Ibb9654db419cbae728792f82ec1da14d81938879
Merge branch 'kitkat' of https://github.com/AOSPA/android_packages_apps_Settings into kitkat