FlxTilemap: Improve debug draw with FlxG.renderBlit
#3509
Merged
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Fixes #3508

Old:
New:

Note: the color is slightly different as well, I believe the new one is "more correct" and the old one was lighter because it drew lines between two pixels, I also think the new way is more performant, though that difference is negligible since the debug tile is drawn once and cached.