Check the entire texture again, fixes wrong tex

Not sure why, but only on Android.  Also faster on Windows (without profiler, takes FF Type-0 demo from ~240 fps to ~265 fps.)

Essentially reverts d56f3055b6, "Don't check the power of two padding in texcache."  May fix #655 and reported to fix a similar issue.  Although, I'm not really clear on why... if anything this will just invalidate more often?

-[Unknown]