Ensure HelpButton doesn't get converted to a borderless varaint.

core/src/main/java/com/github/weisj/darklaf/components/help/HelpButton.java

@@ -42,6 +42,7 @@ public class HelpButton extends JButton {
     protected void init() {
         putClientProperty(DarkButtonUI.KEY_SQUARE, true);
         putClientProperty(DarkButtonUI.KEY_ROUND, true);
+        putClientProperty(DarkButtonUI.KEY_NO_BORDERLESS_OVERWRITE, true);
         setIcon(UIManager.getIcon("HelpButton.helpHighlightIcon"));
         setDisabledIcon(UIManager.getIcon("HelpButton.helpDisabledIcon"));
     }