There is a subtle problem with the Swagger definition for AccessTokens which causes
autogeneration of APIs for these endpoints to fail.
This PR corrects these errors.
Ref: https://github.com/zeripath/java-gitea-api/issues/4
Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>