fix: Flappybalt: bounce panels resetting thier sprites to default on resetState()

[ninjamuffin99]

fixes #366

See my lil comment there on null stuff

[Geokureli]

Should we remove Reg._bitmapData and Reg._rect since it's seems to be no longer cached

If so than please rename this to createBounceImage, have these two calls use the same bitmapData instance via:

		// The bounce panels. Drawn via code in Reg to fit screen height.
		final bounceImage = Reg.createBounceImage(FlxG.height - 34);
		
		// The left bounce panel. 
		
		_bounceLeft = new FlxSprite(1, 17);
		_bounceLeft.loadGraphic(bounceImage, true, 4, FlxG.height - 34);
		_bounceLeft.animation.add("flash", [1, 0], 8, false);
		add(_bounceLeft);

		// The right bounce panel.

		_bounceRight = new FlxSprite(FlxG.width - 5, 17);
		_bounceRight.loadGraphic(bounceImage, true, 4, FlxG.height - 34);
		_bounceRight.animation.add("flash", [1, 0], 8, false);
		add(_bounceRight);

[ninjamuffin99]

how does this implementation look @Geokureli ? the bitmapdata and rect are created just in local variables

[Geokureli]

Thanks!