[BUGFIX] Index on sys_file_processedfile is too large

Resolves: #56786
Related: #54234
Releases: 6.2
Change-Id: I9c91f3e989e65df559542135d0b84025dacbbaf2
Reviewed-on: https://review.typo3.org/28272
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Marcin Sągol
Tested-by: Marcin Sągol
Reviewed-by: Stefan Neufeind
Tested-by: Stefan Neufeind