services/convert: Convert a Repository's ObjectFormatName too

When converting a `repo_model.Repository` to `api.Repository`, copy the
`ObjectFormatName` field too.

Fixes #3458.

Signed-off-by: Gergely Nagy <forgejo@gergo.csillger.hu>

services/convert/repository.go

@@ -237,6 +237,7 @@ func innerToRepo(ctx context.Context, repo *repo_model.Repository, permissionInR
 		MirrorInterval:                mirrorInterval,
 		MirrorUpdated:                 mirrorUpdated,
 		RepoTransfer:                  transfer,
+		ObjectFormatName:              repo.ObjectFormatName,
 	}
 }