Add `lexical-binding` cookie to generated files

Side-companion to commits bb0f84bc0bf7 and 50947fd51202.
While in there, couldn't resist adding a few minor cleanups
I had lying around.

* lisp/savehist.el (savehist-save): Add `lexical-binding:t` cookie.

* lisp/url/url-cookie.el: Remove redundant `:group` arguments.
(url-cookie-write-file): Add `lexical-binding:t` cookie.

* lisp/abbrev.el: Prefer #' to quote function names.
(write-abbrev-file): Add a `lexical-binding:t` cookie.
(unexpand-abbrev): Use `replace-region-contents` and 3-args `<=`.
(define-abbrev-table): Use `defvar-1`.

* lisp/filesets.el (filesets-menu-cache-file-save-maybe):
Add `lexical-binding:t` cookie.
(filesets-ingroup-patterns): Don't quote lambdas.
(filesets-spawn-external-viewer): Remove redundant "" arg to `mapconcat`.

* lisp/recentf.el: Prefer #' to quote function names.
(recentf-save-file-header): Add `lexical-binding:t` cookie and change
mode to match the actual content.

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