State field not available in checkout

On Spree 1.3.1, using this extension will cause the state field not to show up when checking out.  To repro - create a new spree store with 1.3.1, install this extension, then add a product and checkout as guest.  The State field will be missing, and you cannot continue checkout.

This was interacting with the update_state js function in spree_core; changing the name to the expected name makes the base script work again.