fixup! Obsolete `org-icompleting-read' and `org-completing-read-no-i'

* lisp/ol.el (org-insert-link):
* lisp/org-ctags.el (org-ctags-find-tag-interactive):
* lisp/ox-odt.el (org-odt-convert-read-params): Remove the remaining
uses and references to ido-mode.  Rely upon built-in Emacs completion
system using the necessary completion backend rather than directly
calling ido functions.

This commit removes leftovers after
https://git.savannah.gnu.org/cgit/emacs/org-mode.git/commit/?id=fdbf441560

Reported-by: Martin Marshall <law@martinmarshall.com>

lisp/ol.el

@@ -1914,9 +1914,8 @@ non-interactively, don't allow to edit the default description."
 		    (mapcar (lambda (x) (concat x ":")) all-prefixes)
 		    (mapcar #'car org-stored-links)
                     ;; Allow description completion.  Avoid "nil" option
-                    ;; in the case of `completing-read-default' and
-                    ;; an error in `ido-completing-read' when some links
-                    ;; have no description.
+                    ;; in the case of `completing-read-default' when
+                    ;; some links have no description.
                     (delq nil (mapcar 'cadr org-stored-links)))
 		   nil nil nil
 		   'org-link--history

lisp/org-ctags.el

@@ -506,12 +506,11 @@ its subdirectories contain large numbers of taggable files."
 
 (defun org-ctags-find-tag-interactive ()
   "Prompt for the name of a tag, with autocompletion, then visit the named tag.
-Uses `ido-mode' if available.
 If the user enters a string that does not match an existing tag, create
 a new topic."
   (interactive)
-  (let* ((tag (ido-completing-read "Topic: " org-ctags-tag-list
-                       nil 'confirm nil 'org-ctags-find-tag-history)))
+  (let* ((tag (completing-read "Topic: " org-ctags-tag-list
+                               nil 'confirm nil 'org-ctags-find-tag-history)))
     (when tag
       (cond
        ((member tag org-ctags-tag-list)

lisp/ox-odt.el

@@ -4322,15 +4322,15 @@ The list of the form (OUTPUT-FMT-1 OUTPUT-FMT-2 ...)."
 (defun org-odt-convert-read-params ()
   "Return IN-FILE and OUT-FMT params for `org-odt-do-convert'.
 This is a helper routine for interactive use."
-  (let* ((input (if (featurep 'ido) 'ido-completing-read 'completing-read))
-	 (in-file (read-file-name "File to be converted: "
+  (let* ((in-file (read-file-name "File to be converted: "
 				  nil buffer-file-name t))
 	 (in-fmt (file-name-extension in-file))
 	 (out-fmt-choices (org-odt-reachable-formats in-fmt))
 	 (out-fmt
 	  (or (and out-fmt-choices
-		   (funcall input "Output format: "
-			    out-fmt-choices nil nil nil))
+		   (completing-read
+                    "Output format: "
+		    out-fmt-choices nil nil nil))
 	      (error
 	       "No known converter or no known output formats for %s files"
 	       in-fmt))))