Fix classic console and View as plain text buttons missing in console view overflow

[janfaracik]

See #391

Jenkins 2.450 introduced a new way of implementing dropdowns which broke this plugin's dropdown. I've updated it to use the new components.

Testing done

• Links work as expected

Submitter checklist

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1. Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
2. Ensure that the pull request title represents the desired changelog entry
3. Please describe what you did
4. Link to relevant issues in GitHub or Jira
5. Link to relevant pull requests, esp. upstream and downstream changes
6. Ensure you have provided tests - that demonstrates feature works or fixes the issue

[timja]

Thanks!