Displayfix

In testing with a ADAFruit 1.8" display, I noticed some flickering on the menu selector character when there was no movement in the menu. 

The code is from bkubicek's original LCD commit, and I think there was some reverse logic and a little "Patch-up" error. I have, to the best of my ability, suggested the included fixes that works for me (in the standard Ultrapanel setup) and has removed the flickering (by not continually doing unnecessary updates).