Cast retrieved DB fields to string
Cast retrieved DB fields to string

Fixes #9279

If a pure numerical user is in the DB the value might be casted to a int
when returned. Cast it all to a string so we don't break the strict
typing.

Signed-off-by: Roeland Jago Douma <982d370f7dc34a05b4abe8788f899578d515262d@famdouma.nl>

andreas-p/nextcloud-server,andreas-p/nextcloud-server,nextcloud/server,nextcloud/server,andreas-p/nextcloud-server,andreas-p/nextcloud-server,andreas-p/nextcloud-server,nextcloud/server,nextcloud/server