[BUGFIX] Handle pageTSconfig correctly for TS

The page TSconfig includes need to be processed for TypoScript
as well in order to have constants from TSconfig available.

Resolves: #71640
Releases: master
Change-Id: I8dcbfa4498621567e8cb3caac6235031af2c70c1
Reviewed-on: https://review.typo3.org/44764


Reviewed-by: Andreas Wolf <andreas.wolf@typo3.org>
Tested-by: Andreas Wolf <andreas.wolf@typo3.org>
Reviewed-by: Jigal van Hemert <jigal.van.hemert@typo3.org>
Tested-by: Jigal van Hemert <jigal.van.hemert@typo3.org>