Fix viewing default push rules on a Geo secondary

Merged Nick Thomas requested to merge (removed):4110-fix-push-rules-on-geo-secondary into master

What does this MR do?

Removes a database update in a GET operation, allowing the page to work in a Geo secondary

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Fixes a 500 error visiting /admin/push_rules on a secondary.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Closes #4110 (closed)

Edited by Toon Claes