fixes #6461 - create Katello permissions without quotes in db seeds

Katello seeds was creating incorrect permissions in the Foreman DB by
adding a set of superflous quotes -- e.g., "'Katello::ActivationKey'".
This commit removes the extra quotes.
Merge pull request #4415 from stbenjam/6461-duplicates

fixes #6461 - create Katello permissions without quotes in db seeds