Fix table alignment classes (#30144)
Fixes https://github.com/go-gitea/gitea/issues/30142, regression from
https://github.com/go-gitea/gitea/pull/30047. I searched the codebase
and only `bottom aligned` was definitely not in use so I removed it.
(cherry picked from commit b08c7afe5f60075ed62a5ffe034b88624983d007)
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