Swtich API key injection over to helper

lib/open_food_network/spree_api_key_loader.rb

@@ -0,0 +1,8 @@
+module OpenFoodNetwork
+  module SpreeApiKeyLoader
+    def load_spree_api_key
+      current_user.generate_spree_api_key! unless spree_current_user.spree_api_key
+      @spree_api_key = spree_current_user.spree_api_key
+    end
+  end
+end