fix flxBar pixel-perfect rendering #2853
Merged
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closes #2849
FlxBar.draw was using what seems to be an old copy of FlxSprite.draw, where the position was rounded to the nearest pixel, but origin, was not. and since FlxBar's defualt height is 5, origin was - by default - 2.5. this caused the front bar to be half a pixel off in most cases
here is my test case: