Fix pointer style nit

(I really dislike this one for some reason..)

Signed-off-by: Ran Benita <ran234@gmail.com>
keymap: rename xkb_kt_map_entry to xkb_key_type_entry

That's a better name and fits more nicely.
Also change type->map to type->entries.

Signed-off-by: Ran Benita <ran234@gmail.com>