[BUGFIX] Respect "disablePrependAtCopy" during translation

During the translation process the option "disablePrependAtCopy" is not
respected. With this patch the option is respected again for pages and
tt_content.

Resolves: #86293
Releases: master, 8.7
Change-Id: I821f3fed7d3e0637298262c4bd2c11003618f1c5
Reviewed-on: https://review.typo3.org/58424


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Jörg Bösche <typo3@joergboesche.de>
Tested-by: Jörg Bösche <typo3@joergboesche.de>
Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>