Remove out of date comment in UniversalLanguageSelectorHooks::setVersionConstant()

PHP entry point is gone

Change-Id: I3f2093336a78fa081b4aee862788c793f586fb63

includes/UniversalLanguageSelectorHooks.php

@@ -23,9 +23,6 @@ use MediaWiki\MediaWikiServices;
 
 class UniversalLanguageSelectorHooks {
 
-	/**
-	 * Used when extension registration in use which skips the main php file
-	 */
 	public static function setVersionConstant() {
 		global $wgHooks;