option menu: don't subtract nav bar size from width and fix width on 4:3 aspect ratio, don't overscroll when clicking on a category

src/itdelatrisu/opsu/ui/KineticScrolling.java

@@ -47,7 +47,7 @@ public class KineticScrolling {
 	private float totalDelta;
 
 	/** The maximum and minimum value the position can reach. */
-	private float max = Float.MAX_VALUE, min = -Float.MAX_VALUE;
+	public float max = Float.MAX_VALUE, min = -Float.MAX_VALUE;
 
 	/** Whether the mouse is currently pressed or not. */
 	private boolean pressed = false;