Enable eslint `space-before-function-paren` (#30078)
Anonymous are set to ignore as I [couldn't
decide](https://github.com/go-gitea/gitea/pull/30077#discussion_r1538117497).
No current violations.
Rule docs: https://eslint.style/rules/js/space-before-function-paren
(cherry picked from commit bcb151c220c3fa6003810e436acdda9cc0501e58)
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