Update get_customer_verify_beneficial_ownership_from_body/1 to match resp

[jmillxyz]

The Dwolla endpoint at /customers/{id} returns a few _links; one of those is used to populate the Dwolla.Customer struct field verify_beneficial_ownership.

The response I see when hitting this endpoint is (irrelevant portions omitted):

{
	"_links": {
		"verify-beneficial-owners": {
			"href": "https://api-sandbox.dwolla.com/customers/135ceaf3-7774-4f56-a602-ca0f8ea65af9/beneficial-owners",
			"type": "application/vnd.dwolla.v1.hal+json",
			"resource-type": "beneficial-owner"
		},
		"certify-beneficial-ownership": {
			"href": "https://api-sandbox.dwolla.com/customers/135ceaf3-7774-4f56-a602-ca0f8ea65af9/beneficial-ownership",
			"type": "application/vnd.dwolla.v1.hal+json",
			"resource-type": "beneficial-ownership"
		},
                ...
	},
        ...
}

I updated the first get_customer_verify_beneficial_ownership_from_body/1 function clause to account for this.

Please let me know if I can help with tests, or whether you can update the test factory to properly account for this scenario -- it looks like it uses real data from a sandbox account?

Thanks!

[axelclark]

Apologies for the approval, I got confused and thought this PR was in our repo...