[BUGFIX] storagePid is lost when persistence.recursive is set

If recursive storagePid is set via TypoScript, the storagePid
itself is missing in the list of pids.

Resolves: #51064
Releases: 6.2, 6.1
Change-Id: I5f06911bb60b847e4a97b5690e57557d4dec66b7
Reviewed-on: https://review.typo3.org/23086
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Stefan Neufeind
Tested-by: Stefan Neufeind
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring