Magit: Wrap rebase define-keys with (kbd)

Later we use lookup-key in this way:

(lookup-key aux-map (kbd (car cmd)))

which was slightly different from how we were defining the keymap which resulted
in M-j & M-k not being bound or displayed properly.

modes/magit/evil-collection-magit.el

@@ -464,7 +464,7 @@ denotes the original magit key for this command.")
      (dolist (cmd evil-collection-magit-rebase-commands-w-descriptions)
        (when (car cmd)
          (evil-collection-define-key evil-collection-magit-state 'git-rebase-mode-map
-           (car cmd) (nth 1 cmd))))
+           (kbd (car cmd)) (nth 1 cmd))))
 
      (evil-make-overriding-map git-rebase-mode-map evil-collection-magit-state)