Merge pull request #24006 from nextcloud/backport/23999/stable18

[stable18] Remove old legacy scripts references

Author: rullzer

lib/base.php

@@ -371,7 +371,6 @@ private static function printUpgradePage(\OC\SystemConfig $systemConfig) {
 
 		$oldTheme = $systemConfig->getValue('theme');
 		$systemConfig->setValue('theme', '');
-		OC_Util::addScript('config'); // needed for web root
 		OC_Util::addScript('update');
 
 		/** @var \OC\App\AppManager $appManager */