"Disown package" post response does not consider maint/comaint status of any requester

Checklist

This bug template is meant to provide bug issues for code existing in the aurweb repository. This bug template is not meant to handle bugs with user-uploaded packages.

To work out a bug you have found in a user-uploaded package, contact the package's maintainer first. If you receive no response, file the relevant package request against it so TUs can deal with cleanup.

• I confirm that this is an issue with aurweb's code and not a user-uploaded package.
• I have described the bug in complete detail in the Description section.
• I have specified steps in the Reproduction section.
• I have included the versions which are affected in the Version(s) section.

Description

As a co-maintainer, if I go to disown a package which I co-maintain and don't check the confirmation box on the page while submitting the form, I get presented with a page that indicates the error along with extra fields that weren't on the page originally.

Reproduction

1. Go to a comaintained package page as a comaintainer of it.
2. Click "Disown package", which brings you to a page to confirm disowning the package
3. Submit the form without checking the checkbox
4. You are presented with a page that TUs get, which includes a text input for closure comments.

Version(s)

v6.1.1