[openstreetmap/openstreetmap-website] Fix warning on unescaped hyphen in regexp (PR #4600)

[Andy Allan]

```bash
$ bundle exec rails test test/system/user_email_change_test.rb 
/home/andy/src/openstreetmap-website/test/system/user_email_change_test.rb:24: warning: character class has '-' without escape: /\/user\/confirm-email\?confirm_string=[A-Za-z0-9-_%]+\s/
/home/andy/src/openstreetmap-website/test/system/user_email_change_test.rb:26: warning: character class has '-' without escape
/home/andy/.rbenv/versions/3.0.6/lib/ruby/gems/3.0.0/gems/bootsnap-1.18.3/lib/bootsnap/compile_cache/iseq.rb:53: warning: character class has '-' without escape: /\/user\/confirm-email\?confirm_string=[A-Za-z0-9-_%]+\s/
/home/andy/.rbenv/versions/3.0.6/lib/ruby/gems/3.0.0/gems/bootsnap-1.18.3/lib/bootsnap/compile_cache/iseq.rb:53: warning: character class has '-' without escape
```
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/4600

-- Commit Summary --

  * Fix warning on unescaped hyphen in regexp

-- File Changes --

    M test/system/user_email_change_test.rb (4)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/4600.patch
https://github.com/openstreetmap/openstreetmap-website/pull/4600.diff

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