remove redundant asset_path_icon function

app/helpers/topics_helper.rb

@@ -10,7 +10,7 @@ module TopicsHelper
       topic['value'] = t.name
       topic['description'] = t.desc.truncate(70) # make this return matched results
       topic['type'] = t.metacode.name
-      topic['typeImageURL'] = t.metacode.asset_path_icon
+      topic['typeImageURL'] = t.metacode.icon
       topic['permission'] = t.permission
       topic['mapCount'] = t.maps.count
       topic['synapseCount'] = t.synapses.count

app/models/metacode.rb

@@ -14,14 +14,6 @@ class Metacode < ActiveRecord::Base
     return false
   end
 
-  def asset_path_icon
-    if icon.start_with?('http')
-      icon
-    else
-      ActionController::Base.helpers.asset_path icon
-    end
-  end
-
   #output json with asset_paths merged in
   def as_json(options)
     json = super(options.merge!(methods: :asset_path_icon))