completion/selectrum -> completion/vertico, part 2

- Rename module from `:completion selectrum` to `:completion vertico`
- Rename all files involved
- Do *not* yet rename all the functions, as that messes up git's rename
  detection.

modules/app/irc/autoload/irc.el

@@ -69,8 +69,8 @@ argument) is non-nil only show channels in current server."
   (interactive "P")
   (call-interactively
    (cond ((featurep! :completion ivy)       #'+irc/ivy-jump-to-channel)
-         ((featurep! :completion selectrum) #'+irc/selectrum-jump-to-channel)
-         ((user-error "No jump-to-channel backend is enabled. Enable selectrum or ivy!")))))
+         ((featurep! :completion vertico) #'+irc/selectrum-jump-to-channel)
+         ((user-error "No jump-to-channel backend is enabled. Enable vertico or ivy!")))))
 
 ;;;###autoload
 (defun +irc--circe-all-buffers ()

modules/app/irc/autoload/vertico.el

@@ -1,9 +1,9 @@
-;;; app/irc/autoload/selectrum.el -*- lexical-binding: t; -*-
-;;;###if (featurep! :completion selectrum)
+;;; app/irc/autoload/vertico.el -*- lexical-binding: t; -*-
+;;;###if (featurep! :completion vertico)
 
 ;;;###autoload
 (defun +irc/selectrum-jump-to-channel ()
-  "Jump to an open channel or server buffer with selectrum."
+  "Jump to an open channel or server buffer with vertico."
   (interactive)
   (require 'consult)
   (consult--multi (list (plist-put (copy-sequence +irc--consult-circe-source)