Remove invalid 'stick to front' link after bbPress mangles it.

Instead of removing just the link text, we want to remove the link
altogether. This prevents 'empty link' errors in WAVE tests.

See #3269.

wp-content/themes/openlab/lib/plugin-hooks.php

@@ -309,6 +309,22 @@ function( $args ) {
 	}
 );
 
+/**
+ * Fix bbPress's bad 'hide_super_sticky_admin_link' regex.
+ *
+ * It only removes the text, but we want to remove the entire empty element.
+ *
+ * This ensures that we don't get "empty link" errors in WAVE tests.
+ */
+add_filter(
+	'bbp_get_topic_stick_link',
+	function( $link ) {
+		// Remove anchor elements with the class bbp-topic-super-sticky-link.
+		return preg_replace( '/<a[^>]*class="bbp-topic-super-sticky-link"[^>]*><\/a>/', '', $link );
+	},
+	100
+);
+
 /**
  * Handle feature toggling for groups.
  */