evil-core: refactored evil-get-auxiliary-keymap (#1478)

* evil-core: refactored  `evil-get-auxiliary-keymap`

In `evil-get-auxilliary-keymap`, there's already a check on `state` when entering the function.
Should `state` be `nil`, it won't enter the `let*` form.

Hence the binding specification
`(aux (if state (lookup-key map key) map))`
always reduces to
`(aux (lookup-key map key))`

This commit removed unnecessary `if` form.

* minor changes

Author: lebensterben

evil-core.el

@@ -871,10 +871,9 @@ one already."
   (when state
     (let* ((key (vconcat (list (intern (format "%s-state" state)))))
            (parent-aux (when (and ignore-parent
-                                  (keymap-parent map)
-                                  state)
+                                  (keymap-parent map))
                          (lookup-key (keymap-parent map) key)))
-           (aux (if state (lookup-key map key) map)))
+           (aux (lookup-key map key)))
       (cond
        ((and ignore-parent
              (equal parent-aux aux)