Set up FS before querying storage info in settings

The personal info section of the personal settings is querying the
storage quota information. For this it requires the FS to be setup which
is not always guaranteed.

This fixes an issue where refreshing the settings page would cause it to
fail after Redis caches are full. It is likely that when Redis cache is
populated, some code path is initializing the FS, so it works so far.
But when the cache is populated, that code path is skipped so the FS is
not guaranteed to be setup...

Signed-off-by: Vincent Petry <vincent@nextcloud.com>