onUpHandler() should change the status to highlight (#2657)
onUpHandler() should change the status to highlight (#2657)

Having the button status return to "normal" instead of "highlight" after releasing a button press was causing the onOver.sound to play, since the status would always immediately change from "normal" to "highlight".
I'm not sure if there was a reason for doing it this way; I didn't notice any side effects after a quick test.
HaxeFlixel/flixel