Update SwhBrowseUtilsTestCase.get_origin_visit_snapshot with real-world data

Summary:
the data for the get_origin_visit_snapshot is inconsistent with the
real world, which makes it hard to follow

Test Plan: make test results in a passing test

Reviewers: Reviewers, anlambert

Reviewed By: Reviewers, anlambert

Differential Revision: https://forge.softwareheritage.org/D415