useAccountLookup, useGroupLookup: make lookup case insensitive
Fixes https://gitlab.com/soapbox-pub/soapbox/-/issues/1460
Lowercases the name (and slug, for group) before comparison so it can pull out the correct entity.
Fixes https://gitlab.com/soapbox-pub/soapbox/-/issues/1460
Lowercases the name (and slug, for group) before comparison so it can pull out the correct entity.