Fix validation of dotspacemacs-swap-number-row

[fnussbaum]

Fixes #16417

[smile13241324]

I think the comments in the dot file template also need to be changed.

[fnussbaum]

The comment in the template seems to be up to date in the sense that it includes querty-ca-fr already:

   ;; If non-nil shift your number row to match the entered keyboard layout
   ;; (only in insert state). Currently supported keyboard layouts are:
   ;; `qwerty-us', `qwertz-de' and `querty-ca-fr'.
   ;; New layouts can be added in `spacemacs-editing' layer.
   ;; (default nil)
   dotspacemacs-swap-number-row nil

@smile13241324 Is there something else that needs to be changed?

[smile13241324]

Nope that's fine then