Admin user unable to Become Site Manager of Moderated sites

Summary

The admin will only be able to Become Site Manager of a moderated site, once the request to join site has been accepted.

Steps to reproduce

1. Create user1
2. Logged as user1
   • Create a Moderated site
3. Logged as admin
   • Search for the site created
   • Note the action to Request Join - See requestToJoin.png attached

Actual result
Action Request Join is available

Expected result
Action Join to be available instead so the Admin can straight away trigger the Become Site Manager action.