[openstreetmap/openstreetmap-website] Remove redundant cookies_serializer initializer (PR #6475)

[rkoeze]

### Description
In recent years [Rails has cut down on the number of initializers](https://github.com/rails/rails/pull/42538) it ships with. Some  because they are commented out files users may never need. Others because they specify values that are already set by default. This PR, like https://github.com/openstreetmap/openstreetmap-website/pull/6456, simplifies our initializers folder by removing an initializer[ that is already set by default](https://github.com/rails/rails/blob/f73b7f173b3004ec9e920b99dafaaf029887847a/railties/lib/rails/application/configuration.rb#L231) and no longer ships with new Rails projects.

### How has this been tested?
The tests pass and I was able to navigate the app. Running `Rails.application.config.action_dispatch.cookies_serializer` returned `:json` before and after this change.

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

  https://github.com/openstreetmap/openstreetmap-website/pull/6475

-- Commit Summary --

  * Remove serializer that sets already set default

-- File Changes --

    D config/initializers/cookies_serializer.rb (7)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/6475.patch
https://github.com/openstreetmap/openstreetmap-website/pull/6475.diff

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