fix(default): missing evil-ex-registers for non-ivy users

It was `evil-show-registers' that we wanted, not
`evil-ex-registers' (which never existed in the first place). Folks who
did not have :completion ivy enabled (e.g. vertico and helm users) would
see 'commandp, evil-ex-registers' errors when pressing `SPC i r`. Folks
who had it enabled would transparently invoke `counsel-evil-registers'
instead (because it was remapped).

Fix: #5753

modules/completion/ivy/config.el

@@ -188,7 +188,7 @@ results buffer.")
     [remap describe-function]        #'counsel-describe-function
     [remap describe-variable]        #'counsel-describe-variable
     [remap describe-symbol]          #'counsel-describe-symbol
-    [remap evil-ex-registers]        #'counsel-evil-registers
+    [remap evil-show-registers]      #'counsel-evil-registers
     [remap evil-show-marks]          #'counsel-mark-ring
     [remap execute-extended-command] #'counsel-M-x
     [remap find-file]                #'counsel-find-file