Set the common ActionMailer default_url_options only once

There is no need to set options other than the foodcoop during every
change of the scope. This also makes sure that the correct options will
be loaded during testing to fix problems with newer rails versions.

spec/app_config.yml

@@ -19,6 +19,8 @@ default: &defaults
   tax_default: 6.0
   email_sender: noreply@minimal.test
 
+  host: localhost
+
 
 development:
   <<: *defaults

spec/spec_helper.rb

@@ -32,6 +32,7 @@ RSpec.configure do |config|
   # without messing up tests run after that
   config.before(:each) do
     FoodsoftConfig.init
+    FoodsoftConfig.init_mailing
   end
 
   # If true, the base class of anonymous controllers will be inferred