move map icons to public/

app/serializers/api/cached_enterprise_serializer.rb

@@ -129,7 +129,7 @@ module Api
         producer_shop: "map_003-producer-shop.svg",
         producer: "map_001-producer-only.svg",
       }
-      ImagePathGenerator.call(icons[enterprise.category])
+      "map_icons/" + icons[enterprise.category]
     end
 
     # Choose regular icon font for enterprises.

app/serializers/api/enterprise_shopfront_list_serializer.rb

@@ -19,7 +19,7 @@ module Api
         producer_shop: "map_003-producer-shop.svg",
         producer: "map_001-producer-only.svg",
       }
-      ImagePathGenerator.call(icons[enterprise.category])
+      "map_icons/" + icons[enterprise.category]
     end
 
     def icon_font

app/services/image_path_generator.rb

@@ -1,10 +0,0 @@
-# frozen_string_literal: true
-
-class ImagePathGenerator
-  # Since Rails 4 has adjusted the way assets paths are handled, we have to access certain
-  # asset-based helpers like this when outside of a view or controller context.
-  # See: https://stackoverflow.com/a/16609815
-  def self.call(path)
-    ActionController::Base.helpers.image_path(path)
-  end
-end