Completely remove some commented-out code

This removes the workaround code that was commented out in the
previous commit, 59719ac.

ido-completing-read+.el

@@ -520,12 +520,6 @@ completion for them."
           (if ido-cr+-dynamic-collection
               (memoize (indirect-function 'all-completions))
             'all-completions))
-         ;; ;; Disable flx-ido for dynamic collections in Emacs 26.
-         ;; ;; Temporary workaround for #146.
-         ;; (flx-ido-mode
-         ;;  (and (bound-and-true-p flx-ido-mode)
-         ;;       (or (version< emacs-version "26")
-         ;;           (not ido-cr+-dynamic-collection))))
          ;; If the whitelist is empty, everything is whitelisted
          (whitelisted (not ido-cr+-function-whitelist))
          ;; If non-nil, we need alternate nil DEF handling