Follow-up to #91.

Pass the border color into CurveRenderState instead of determining it there; store the color as a static field in Curve (since it shouldn't change per-beatmap).

Also removed the leftover FrameBufferCache warning from #64.

Signed-off-by: Jeffrey Han <itdelatrisu@gmail.com>

src/itdelatrisu/opsu/states/Game.java

@@ -1393,7 +1393,8 @@ public class Game extends BasicGameState {
 		Circle.init(container, circleSize);
 		Slider.init(container, circleSize, beatmap);
 		Spinner.init(container);
-		Curve.init(container.getWidth(), container.getHeight(), circleSize);
+		Curve.init(container.getWidth(), container.getHeight(), circleSize, (Options.isBeatmapSkinIgnored()) ?
+				Options.getSkin().getSliderBorderColor() : beatmap.getSliderBorderColor());
 
 		// approachRate (hit object approach time)
 		if (approachRate < 5)