[TASK] change intval() to (int)

Typecasting with (int) is about 2-3 times faster than using intval().

Change-Id: Ifddcaaf9bf5c1fa77c632df10cba62c82d4614d1
Resolves: #81544
Releases: master, 8.7
Reviewed-on: https://review.typo3.org/53183


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Josef Glatz <josef.glatz@typo3.org>
Tested-by: Josef Glatz <josef.glatz@typo3.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>