[BUGFIX] Don't pre-calculcate asset paths in t3editor

With this patch, the path resolving for certain assets is now completely
handled by PageRenderer by using the EXT: prefix.

Resolves: #91365
Releases: master, 10.4, 9.5
Change-Id: Ia23650244f70f5e4cdf8d953bfcb2f0fcf01ef6a
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64781


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Jörg Bösche <typo3@joergboesche.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Jörg Bösche <typo3@joergboesche.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>