Update map to use AWMC maptiles

[wlpotter]

@wsalesky Please update the maptiles used on C-M.org with the newly restored AWMC maptiles. http://cawm.lib.uiowa.edu/index.html

Cf. email from @davidamichelson on 2022-06-20.

[davidamichelson]

Reforwarding the e-mail.

[wsalesky]

Fixed.