Fix bug automerge cannot be chosed when there is only 1 merge style (#33040)#33043

lunny merged 1 commit intogo-gitea:release/v1.23go-gitea/gitea:release/v1.23from

GiteaBot:backport-33040-v1.23GiteaBot/gitea:backport-33040-v1.23Copy head branch name to clipboard