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fix https://github.com/go-gitea/gitea/issues/32226 in https://github.com/go-gitea/gitea/pull/27775 , it do some changes to only show diff file tree when more than one file changed. But looks it also break the `diff-file-list` logic, which looks not expected change. so try fix it. /cc @silverwind example view: ![image](https://github.com/user-attachments/assets/281e9c4f-a269-4d36-94eb-a132058aea87) Signed-off-by: a1012112796 <1012112796@qq.com>