bug#46878: 27.1; lisp-outline-level returns imprecise level number

[Juri Linkov]

> The following version returns the right level following the
> convention that ;;; are top level comments and each lower
> level adds a ;.

I use outline-minor-mode extensively in lisp-mode,
so after trying your version I'd say that while
the change of the level definition can be surprising
to someone, but to me your version makes more sense than
the current level definition.