[openstreetmap/openstreetmap-website] Avoid using or comparing explicit model ids (#1658)

[Andy Allan]

The code is easier to read using higher-level concepts. This PR isn't comprehensive but it fixes a few obvious cases in the controllers.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/1658

-- Commit Summary --

  * Avoid using or comparing explicit model ids

-- File Changes --

    M app/controllers/changeset_controller.rb (4)
    M app/controllers/message_controller.rb (10)
    M app/controllers/user_blocks_controller.rb (8)
    M app/controllers/user_controller.rb (4)
    M app/controllers/user_roles_controller.rb (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/1658.patch
https://github.com/openstreetmap/openstreetmap-website/pull/1658.diff

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