Every type of standard window uses the same number of tiles for their
border, so we can have a single constant instead of one for each type.
This also switches to frame instead of border to align with
`Window_Draw...Frame`.
Finally, this renames the base tile constants in
`wonder_cards_app.c` to align with the `border` -> `frame` change.
* Document the Wonder Cards application
* Rename module and text bank
Text bank `unk_0421` -> `mystery_gift_menu`
Module `ov97_02230410` -> `wonder_cards_app`
