MW 1.35: Re-add class attribute for ULS

Without the class attribute, the ULS does not open on MW <= 1.35.
This was changed in Ie9e30af5468aea9803d77c9a36e480ba2b2e86a0

Bug: T294021
Change-Id: I1bcf4e442e85f8848c5e4ff5609204602265b949

includes/UniversalLanguageSelectorHooks.php

@@ -220,6 +220,17 @@ class UniversalLanguageSelectorHooks {
 
 		// The element id will be 'pt-uls'
 		$langCode = $context->getLanguage()->getCode();
+
+		if ( version_compare( MW_VERSION, '1.36', '<' ) ) {
+			return [
+				'uls' => [
+					'text' => Language::fetchLanguageName( $langCode ),
+					'href' => '#',
+					'class' => 'uls-trigger',
+					'active' => true
+				]
+			] + $personal_urls;
+		} else {
 			return [
 				'uls' => [
 					'text' => Language::fetchLanguageName( $langCode ),
@@ -233,6 +244,7 @@ class UniversalLanguageSelectorHooks {
 				]
 			] + $personal_urls;
 		}
+	}
 
 	/**
 	 * @param array $preferred