Fix E2E govern specs for filtered search feature flag

What does this MR do and why?

Fix change vulnerability status spec to work in both feature flag states for vulnerability_report_advanced_filtering FF.

Relates to: #461959

To run against gdk:

WEBDRIVER_HEADLESS=false GITLAB_ADMIN_PASSWORD="password" GITLAB_QA_ADMIN_ACCESS_TOKEN=token GITLAB_PASSWORD="password" QA_LOG_LEVEL=DEBUG QA_GITLAB_URL=http://172.16.123.1:3000 bundle exec rspec  ./qa/specs/features/ee/browser_ui/10_govern/change_vulnerability_status_spec.rb

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