fixes#33119
routers/web/repo/view_home.go

Calling `updateContextRepoEmptyAndStatus` will always ask the DB to
update the updated Unix attributes.
When revisiting the repo's home page, the timestamp will be updated
unexpectedly, so I added the needsUpdate variable to check whether, in
the end, the commitment to db update is necessary if columns have not
changed at all.
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Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>