* lisp/mail/footnote.el: Minor simplifications
Remove redundant :group args. (footnote-mode-hook): Let define-minor-mode define it. (footnote--style-p): Delete function. (footnote--index-to-string): Inline it instead, and simplify. (footnote-cycle-style): Use a pointer into the alist as the "index" instead of a number. (footnote-set-style): Use footnote-style-alist as the completion table. Prefer `assq` over `footnote--assoc-index`. (footnote--assoc-index): Delete function. (footnote--renumber): Remove first (unused) argument; Adjust all callers. (footnote--sort): Use car-less-than-car.
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