[BUGFIX] Set internalUploadMap on upload in ExtendedFileUtility

Since introducing FAL the internalUploadMap array in
ExtendedFileUtility was not set on uploading files.

Resolves: #58463
Releases: 6.2, 6.1, 6.0
Change-Id: I4a537a57f1b688c26c20b9f68356a4be67bc5851
Reviewed-on: https://review.typo3.org/29885
Reviewed-by: Nicole Cordes
Tested-by: Nicole Cordes