Fix Roadie dev config to inline CSS in emails

Roadie doesn't work with asset host:

* https://github.com/Mange/roadie-rails?tab=readme-ov-file#known-issues

And we don't need it.

app/mailers/application_mailer.rb

@@ -18,6 +18,7 @@ class ApplicationMailer < ActionMailer::Base
 
   def roadie_options
     # This lets us specify assets using relative paths in email templates
-    super.merge(url_options: { host: URI(main_app.root_url).host })
+    url = URI(main_app.root_url)
+    super.merge(url_options: { host: url.host, port: url.port })
   end
 end

config/environments/development.rb

@@ -70,8 +70,6 @@ Openfoodnetwork::Application.configure do
   # Show emails using Letter Opener
   config.action_mailer.delivery_method = :letter_opener
   config.action_mailer.default_url_options = { host: "localhost:3000" }
-  config.action_mailer.asset_host = "http://localhost:3000"
-  config.asset_host = "http://localhost:3000"
 
   config.log_level = ENV.fetch("DEV_LOG_LEVEL", :debug)
 end