Fix linter

Signed-off-by: Joas Schilling <coding@schilljs.com>

Author: nickvergessen

lib/private/Comments/Comment.php

@@ -233,7 +233,7 @@ public function getMentions() {
 			return [];
 		}
 		$uids = array_unique($mentions[0]);
-		usort($uids, static function($uid1, $uid2) {
+		usort($uids, static function ($uid1, $uid2) {
 			return mb_strlen($uid2) <=> mb_strlen($uid1);
 		});
 		$result = [];