Use format-prompt in read-file-name calls that have a default

Use format-prompt in read-file-name calls that have a default

* lisp/xwidget.el (xwidget-webkit-save-as-file):
* lisp/vc/vc.el (vc-backend-for-registration, vc-delete-file)
(vc-rename-file):
* lisp/vc/ediff-ptch.el (ediff-prompt-for-patch-file):
* lisp/vc/diff-mode.el (diff-tell-file-name):
* lisp/progmodes/etags.el (visit-tags-table)
(visit-tags-table-buffer):
* lisp/misearch.el (multi-isearch-read-files):
* lisp/mail/rmailmm.el (rmail-mime-save):
* lisp/help-fns.el (doc-file-to-man, doc-file-to-info):
* lisp/gnus/gnus-bookmark.el (gnus-bookmark-load):
* lisp/files.el (write-file, basic-save-buffer):
* lisp/dired.el (dired-read-dir-and-switches):
* lisp/bookmark.el (bookmark-save, bookmark-load):
* lisp/abbrev.el (write-abbrev-file, abbrev-edit-save-to-file):
Use format-prompt in read-file-name calls that have a default.