Description of problem:
A local repo configured to reference a GPG signing key does not reflect that key in the generated config.repo file.

Version-Release number of selected component (if applicable):
Satellite 6.13.x

How reproducible:
100% reproducible

Steps to Reproduce:
1. Add a GPG key to the Content Credentials
2. Add a repository and indicate that its contents are signed with that GPG key
3. Upload an RPM that is signed with that GPG key to the repository
4. Visit the Repository "Published At" URL
5. Download the linked `config.repo` file

Actual results:
The config.repo file has:
~~~
gpgcheck=0
~~~

Expected results:
~~~
gpgcheck=1
gpgurl=https://mysatellite.cmu.edu/katello/api/v2/repositories/REPOID/gpg_key_content
~~~

Additional info:

QE Tracker for https://issues.redhat.com/browse/SAT-23100
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2263069