fix(tests): Fix "FxiOS v1 sign_in - verified, verify same browser" Cirlce (#4334) r=vladikoff
fix(tests): Fix "FxiOS v1 sign_in - verified, verify same browser" Cirlce (#4334) r=vladikoff

The user state was not being cleared correctly between tests.
mozilla/fxa-content-server,mozilla/fxa-content-server,shane-tomlinson/fxa-content-server,mozilla/fxa-content-server,shane-tomlinson/fxa-content-server,shane-tomlinson/fxa-content-server