[BUGFIX] Set correct PID for file references on new pages

Allow inline parent UID to have a "NEW..." placeholder value.

Resolves: #82931
Releases: master, 9.5, 8.7
Change-Id: I1714160d14d226a02663568947ed9525ad07d347
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/54598


Tested-by: Markus Klein <markus.klein@typo3.org>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Steffen Frese <steffenf14@gmail.com>
Tested-by: Sascha Rademacher <sascha.rademacher+typo3@gmail.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Steffen Frese <steffenf14@gmail.com>
Reviewed-by: Sascha Rademacher <sascha.rademacher+typo3@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>