Merged PR should hide re-request review button

[yp05327]

Description

After PR merged, I can still request or remove review request.

https://gitea.com/gitea/gitea-docusaurus/pulls/92

Gitea Version

latest

Can you reproduce the bug on the Gitea demo site?

No

Log Gist

No response

Screenshots

No response

Git Version

No response

Operating System

No response

How are you running Gitea?

gitea.com

Database

None