Replace "(default %s)" with 'format-prompt'

Replace "(default %s)" with 'format-prompt'

* lisp/cmuscheme.el (scheme-load-file, scheme-compile-file):
* lisp/comint.el (comint-get-source):
* lisp/emulation/viper-cmd.el (viper-quote-region, viper-kill-buffer)
(viper-query-replace, viper-read-string-with-history):
* lisp/eshell/esh-mode.el (eshell-find-tag):
* lisp/gnus/gnus-sum.el (gnus-articles-to-read)
(gnus-summary-search-article-forward)
(gnus-summary-search-article-backward):
* lisp/international/mule-cmds.el (set-input-method, toggle-input-method)
(describe-input-method, set-language-environment)
(describe-language-environment):
* lisp/mh-e/mh-gnus.el (mh-mml-minibuffer-read-disposition):
* lisp/mh-e/mh-letter.el (mh-insert-letter):
* lisp/mh-e/mh-mime.el (mh-display-with-external-viewer)
(mh-mime-save-parts, mh-mh-forward-message)
(mh-mml-query-cryptographic-method, mh-minibuffer-read-type):
* lisp/mh-e/mh-seq.el (mh-read-seq, mh-read-range):
* lisp/mh-e/mh-utils.el (mh-prompt-for-folder):
* lisp/progmodes/etags.el (find-tag-tag):
(find-tag-noselect, find-tag, find-tag-other-window)
(find-tag-other-frame, find-tag-regexp):
* lisp/progmodes/idlwave.el (idlwave-find-module):
* lisp/progmodes/inf-lisp.el (lisp-load-file, lisp-compile-file):
* lisp/progmodes/tcl.el (tcl-load-file, tcl-restart-with-file):
* lisp/progmodes/xref.el (xref--read-identifier):
(xref-find-definitions, xref-find-definitions-other-window)
(xref-find-definitions-other-frame, xref-find-references):
* lisp/ses.el (ses-read-printer):
(ses-read-cell-printer, ses-read-column-printer)
(ses-read-default-printer, ses-define-local-printer):
* lisp/subr.el (read-number):
* lisp/term.el (term-get-source):
* src/minibuf.c (read-buffer): Remove prompt suffix and
use 'format-prompt'.
* lisp/minibuffer.el (format-prompt): Ignore DEFAULT empty strings
(bug#47286).