completion/selectrum -> completion/vertico, part 3

- Rename all functions and variables in the module to reflect the
  namechange (and the irc jump function)

modules/app/irc/autoload/irc.el

@@ -69,7 +69,7 @@ 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 vertico) #'+irc/selectrum-jump-to-channel)
+         ((featurep! :completion vertico)   #'+irc/vertico-jump-to-channel)
          ((user-error "No jump-to-channel backend is enabled. Enable vertico or ivy!")))))
 
 ;;;###autoload

modules/app/irc/autoload/vertico.el

@@ -2,7 +2,7 @@
 ;;;###if (featurep! :completion vertico)
 
 ;;;###autoload
-(defun +irc/selectrum-jump-to-channel ()
+(defun +irc/vertico-jump-to-channel ()
   "Jump to an open channel or server buffer with vertico."
   (interactive)
   (require 'consult)