[BUGFIX] Remove unused if in PasswordHashing

A useless if can be dropped since the deprecation
removals.

Resolves: #87208
Releases: master
Change-Id: Ib664a3d50fb4aeb7956606b054e46a0be84d1e92
Reviewed-on: https://review.typo3.org/59206


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>