[BUGFIX] Prevent non-numeric value warning in PhpErrorCodeViewHelper

This commit prevents a warning regarding a non-numeric value in the
phpErrorCode argument of the PhpErrorCodeViewHelper. TYPO3 Fluid is
actually not converting the value to int, and there could be anything
incoming as parameter.

Resolves: #91929
Releases: master, 10.4, 9.5
Change-Id: I3514004829f97849b9fb6f16b07f9ffb53679f87
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/65181


Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>