Fix stability of check for scroll-up button in t/ui/14-dashboard.t
#4090
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See https://progress.opensuse.org/issues/95839
Since #4079 is already at 162 of 200 retries (https://app.circleci.com/pipelines/github/os-autoinst/openQA/7226/workflows/a03ad42e-7967-4447-8698-9aa3b930a7c4/jobs/68213) and locally 200 of 200 runs have already passed I'm preparing this PR.