Search icon and search box are both being shown on larger breakpoints.

when 58cad116 was merged, we started showing both the search box as well as the search icon in the top nav.

Based on my first investigation, this is probably due to a problem in gitlab-ui, where breakpoint-specific classes can get overwritten by general classes due to their order, there is now both an issue (gitlab-ui#1454 (closed)) and a draft MR for this, but we should fix this problem in the GitLab codebase itself instead of waiting for the underlying gitlab-ui update.