fix(doom-dashboard): :key param & keymap precedence
fix(doom-dashboard): :key param & keymap precedence

- Fixes the :key property in +doom-dashboard-menu-sections, which
  formerly threw an error.
- When looking up commands in +doom-dashboard-menu-sections, the
  dashboard will now prioritize keys in +doom-dashboard-mode-map.

Close: #6194
Co-authored-by: Gerry Agbobada <fb5daedec2b068bd4905b282050d4c9a07f849e0@users.noreply.github.com>

hlissner/doom-emacs,hlissner/doom-emacs,hlissner/doom-emacs,hlissner/doom-emacs,hlissner/doom-emacs,hlissner/doom-emacs,hlissner/doom-emacs