Revert "Added patched support for UPS negotiated rates"
ActiveShipping has now fixed the need for this override
see https://github.com/Shopify/active_shipping/pull/84
also removed override include on engine
This reverts commit 051299762b502ce1f04ef4f9be9852ab261f7f63.

Conflicts:
	active_shipping_extension.rb
	app/models/calculator/ups/base.rb
	lib/spree/active_shipping/ups_override.rb