fix oauth1 (twitter) login with sso host and multiple shards
fix oauth1 (twitter) login with sso host and multiple shards

test plan:
 * set up sso on a different shard
 * log in via twitter
 * it should work

Change-Id: If6c52892342cae513701c925087a23678b818e6d
Reviewed-on: https://gerrit.instructure.com/57312
Tested-by: Jenkins
Reviewed-by: Rob Orton <7e09c9d3e96378bf549fc283fd6e1e5b7014cc33@instructure.com>
Product-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
QA-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>

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