adplus id module: flaky test

[patmmccann]

see multiple failures at https://github.com/prebid/Prebid.js/actions/runs/17101434050/job/48498948990?pr=13781 from a test added in #13492

AplusBidAdapter
  pbjs "get id" methods
    pbjs.getUserIds()
      ✗ should return the IDs in the correct schema from our id server
AssertionError: expected undefined to exist
    at Context.<anonymous> (/tmp/_karma_webpack_304555/commons.js:1084930:38)