[openstreetmap/openstreetmap-website] Use a list group for search results (#2509)

[Andy Allan]

As requested in #2497 , this PR changes the search results to use list-groups, which sorts out the extra margins on that page. I also spotted some fallback text in the query tool that needed the new list item classes, so I've added them too.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/2509

-- Commit Summary --

  * Add query-result classes for errors and nothing_found messages
  * Move the search results to use list-group-flush

-- File Changes --

    M app/assets/javascripts/index/query.js (3)
    M app/assets/javascripts/index/search.js (6)
    M app/assets/stylesheets/common.scss (7)
    M app/views/geocoder/results.html.erb (10)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/2509.patch
https://github.com/openstreetmap/openstreetmap-website/pull/2509.diff

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