[openstreetmap/openstreetmap-website] Fix opensearch icon & update attribution (PR #3479)

[Harry Bond]

Closes #3478 
this PR fixes the Opensearch icon and metadata

icon used to look like this:
<img width="211" alt="Screenshot 2022-02-28 at 11 11 15" src="https://user-images.githubusercontent.com/26939824/155990087-71d33797-caef-4ce6-8a14-96b51790a89a.png">
now icon looks like this: 
<img width="211" alt="Screenshot 2022-02-28 at 13 14 54" src="https://user-images.githubusercontent.com/26939824/155990024-e9f3934b-a002-45e0-904a-26497948e7f4.png">


Signed-off-by: Harry Bond <endim8 at pm.me>
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/3479

-- Commit Summary --

  * Fix opensearch icon & update attribution

-- File Changes --

    M app/assets/opensearch/osm.xml (7)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/3479.patch
https://github.com/openstreetmap/openstreetmap-website/pull/3479.diff

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