[openstreetmap/openstreetmap-website] Use .add method for adding errors (#3138)

[Andy Allan]

This avoids a deprecation warning on rails 6.1
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/3138

-- Commit Summary --

  * Use .add method for adding errors

-- File Changes --

    M app/validators/characters_validator.rb (4)
    M app/validators/whitespace_validator.rb (4)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/3138.patch
https://github.com/openstreetmap/openstreetmap-website/pull/3138.diff

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