Use format-prompt in calls to completing-read with a default value

Use format-prompt in calls to completing-read with a default value

* lisp/textmodes/rst.el (rst-insert-list-new-item):
* lisp/tab-bar.el (tab-bar-switch-to-tab):
* lisp/profiler.el (profiler-start):
* lisp/frame.el (set-frame-font):
* lisp/erc/erc.el (erc-join-channel):
* lisp/emacs-lock.el (emacs-lock--set-mode):
* lisp/emacs-lisp/elp.el (elp-set-master):
* lisp/emacs-lisp/checkdoc.el ()
(checkdoc-this-string-valid-engine):
* lisp/calendar/todo-mode.el (todo-find-filtered-items-file):
* lisp/calendar/calendar.el (calendar-set-date-style): Use
`format-prompt' in calls to completing-read that has a default
value, but didn't mention that in the prompt.