Horizontal scrollbar in the Filtered Search component makes it hard to use the search bar

The following discussion from gitlab-org/gitlab-ui!4426 (merged) should be addressed:

• @eduardosanz started a discussion: (+3 comments)

  we need to find a better solution for the scrolling behaviour. For instance, check this image out: When the scrollbar is visible, it's impossible to select a token and makes the user experience problematic.