Fix typo in application setup

This was forcing env test in all environments breaking payment methods that are activated by environment

config/application.rb

@@ -25,7 +25,7 @@ module Openfoodnetwork
 
     config.after_initialize do
       # We need this here because the test env file loads before the Spree engine is loaded
-      Spree::Core::Engine.routes.default_url_options[:host] = 'test.host' if Rails.env = 'test'
+      Spree::Core::Engine.routes.default_url_options[:host] = 'test.host' if Rails.env == 'test'
     end
 
     # We reload the routes here