Panic in RestoreBranchPost if click restore branch muiltple time in one branch

Description

We know that deleted branches will retain a history for a period of time if garbage collection is not run.

If the branch has been restored, executing restore again will cause panic.

Gitea Version

1.19.0+dev

Can you reproduce the bug on the Gitea demo site?

Yes

Log Gist

https://gist.github.com/xin-u/b7aa208c095c833f4a0e09adbce4decb

Screenshots

No response

Git Version

main

Operating System

No response

How are you running Gitea?

build from source

Database

SQLite