[TASK] Cleanup unnecessary variables

Classes/Service/MailTemplateService.php

@@ -576,9 +576,7 @@ class MailTemplateService {
 	 */
 	protected function getPageUid(): int {
 		if (TYPO3_MODE === 'FE') {
-			/** @var TypoScriptFrontendController $typoscriptFrontendController */
-			$typoscriptFrontendController = $GLOBALS['TSFE'];
-			$pageUid = (int) $typoscriptFrontendController->id;
+			$pageUid = (int) $GLOBALS['TSFE']->id;
 		} else {
 			$pageUid = (int) GeneralUtility::_GP('id');
 		}