correct getLast call

Author: moehreag

1.20/src/main/java/io/github/axolotlclient/util/options/vanilla/AxoGraphicsWidget.java

@@ -61,7 +61,7 @@ public void init() {
 
 			int buttonX = gridX + maxGridWidth + 10;
 			int buttonY = gridY + 60;
-			var back = (ButtonWidget) children().getLast();
+			var back = (ButtonWidget) children().get(children().size()-1);
 			remove(back);
 			addDrawableChild(ButtonWidget.builder(Text.translatable("graphics.copy_text"),
 					btn -> client.keyboard.setClipboard(Base64.getEncoder().encodeToString(graphics.getPixelData())))