[openstreetmap/openstreetmap-website] Make blank role icons transparent (PR #4771)

[Anton Khorev]

Before:
![image](https://github.com/openstreetmap/openstreetmap-website/assets/4158490/4fc55385-a754-4d42-9278-78b24f78ea94)
![image](https://github.com/openstreetmap/openstreetmap-website/assets/4158490/da822dbe-5d99-4b96-b8ff-d7d943058b70)

After:
![image](https://github.com/openstreetmap/openstreetmap-website/assets/4158490/bdc74100-394d-4e51-955a-ff87974b6321)
![image](https://github.com/openstreetmap/openstreetmap-website/assets/4158490/91eb89e9-a7be-4465-8af0-0f55249d4831)

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/4771

-- Commit Summary --

  * Make blank role icons transparent

-- File Changes --

    M app/helpers/user_roles_helper.rb (7)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/4771.patch
https://github.com/openstreetmap/openstreetmap-website/pull/4771.diff

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