fix back button

Make it immune to the "do not hover if options visible" hack.
Make the states render it, not the options menu.

src/yugecin/opsudance/ui/BackButton.java

@@ -172,11 +172,11 @@ public class BackButton {
 	/**
 	 * Processes a hover action depending on whether or not the cursor
 	 * is hovering over the button.
-	 * @param delta the delta interval
-	 * @param cx the x coordinate
-	 * @param cy the y coordinate
 	 */
-	public void hoverUpdate(int delta, int cx, int cy) {
+	public void hoverUpdate() {
+		final int delta = renderDelta;
+		final int cx = mouseX;
+		final int cy = mouseY;
 		if (backButton != null) {
 			backButton.hoverUpdate(delta, cx, cy);
 			return;

src/yugecin/opsudance/ui/OptionsOverlay.java

@@ -702,7 +702,6 @@ public class OptionsOverlay implements ResolutionChangedListener {
 		prevMouseY = mouseY;
 		updateHoverOption(mouseX, mouseY);
 		updateIndicatorAlpha();
-		backButton.hoverUpdate(delta, mouseX, mouseY);
 		if (isAdjustingSlider) {
 			int sliderValue = ((NumericOption) hoverOption).val;
 			updateSliderOption();