Recalculate z_min before sending to verify_zoom_results

Enabling settings override leads to some request zoom values not appearing in result metadata. This is because values like: [1., 2., 3., ..., 10.] may be applied as [4., 4., 4., ..., 9., 10.]. This leads to an assertion failure in verify_zoom_results as it works with an incorrect min zoom value.

Test: Modified ITS test
Bug: 295796446
Change-Id: Iedbcbce18358a8257aa4e4089ad5a6aa723d51df