Fix viewing default push rules on a Geo secondary

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

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