[BUGFIX] Cleanup AssetCollector

Optimize loop for rendering.

Resolves: #90544
Releases: master
Change-Id: I9775ac3e1d2f500f35c926dc3bfdc06df96c6b7c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63440


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>