[TASK] Remove superfluous typecast in TSFE

This change removes a superfluous typecast in
`TypoScriptFrontendController`.

Additionally, the function's doc comment has been revised
and the `@param` comment has been removed, since the
function parameter is self-explaining.

Resolves: #103859
Releases: main
Change-Id: I66bdfbbaf0854bff25a801849b253a607cc122b6
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/84313


Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Chris Müller <typo3@brotkrueml.dev>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Chris Müller <typo3@brotkrueml.dev>

typo3/sysext/frontend/Classes/Controller/TypoScriptFrontendController.php

@@ -954,14 +954,11 @@ class TypoScriptFrontendController implements LoggerAwareInterface
     }
 
     /**
-     * Sets the cache-timeout in seconds
-     *
-     * @param int $seconds Cache-timeout in seconds
+     * Sets the default page cache timeout in seconds
      * @internal
      */
     public function set_cache_timeout_default(int $seconds): void
     {
-        $seconds = (int)$seconds;
         if ($seconds > 0) {
             $this->cacheTimeOutDefault = $seconds;
         }