[TASK] Update SQL definition for sys_file_storage

There are missing indexes as well as a mismatch between the
TCA definition (and therefore actual usage) and the SQL
definition at database level.

This change
* adds combined index to deleted / hidden to speedup the
  query initializing storages in Be_UserAuth

* changes SQL definition for field "name" to match their
  usage in TCA

Resolves: #54923
Releases: 6.2
Change-Id: I86f345a941802304ed7fbe29d00ae38130f8e5d2
Reviewed-on: https://review.typo3.org/26768
Reviewed-by: Steffen Ritter
Tested-by: Steffen Ritter
Reviewed-by: Oliver Klee
Reviewed-by: Benjamin Mack
Tested-by: Benjamin Mack