Remove `action_mailer.default_url_options` override in development

Developers could use different protocol/host/port in development.

For instance, I use `https://gdk.test:3443`.
I noticed that links in emails point to `http://localhost:3000`.

This change should make links to be generated based on a developer's configs.

This setting is set by
`Rails.application.routes.default_url_options = default_url_options`
in `config/initializers/default_url_options.rb`.

config/environments/development.rb

@@ -42,8 +42,6 @@ Rails.application.configure do
   # Raises helpful error messages.
   config.assets.raise_runtime_errors = true
 
-  # For having correct urls in mails
-  config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }
   # Open sent mails in browser
   config.action_mailer.delivery_method = :letter_opener_web
   # Log mail delivery errors