[BUGFIX] StorageRepository::findByStorageType() uses wrong typeField

The table "sys_file_storage" has no field "type".
Use the field "driver" instead.

Resolves: #48127
Releases: 6.2, 6.1, 6.0
Change-Id: I64e66a8244ddae85faf68ec3d46b4b9f2f1934ff
Reviewed-on: https://review.typo3.org/21993
Reviewed-by: Stefan Neufeind
Tested-by: Stefan Neufeind