Fix two bugs in removing bookmark fringe marks

Fix two bugs in removing bookmark fringe marks

This fixes bug#70019 and a separate fringe-mark removal bug that
also affected bookmarks in certain Info nodes.

* lisp/bookmark.el (bookmark--remove-fringe-mark): Fix bug#70019 by
temporarily widening in order to ensure we fetch the right overlays.
Also, normalize both filenames before comparing, to avoid spurious
failure to match.

Thanks to Dani Moncayo for the bug report and for testing.

(cherry picked from commit 63765a74f15ef22109750414ec3025c8a40039f0)