Remove duplicated spec

spec/models/asset_spec.rb

@@ -1,16 +0,0 @@
-require 'spec_helper'
-
-describe Spree::Asset do
-  describe "#viewable" do
-    it "touches association" do
-      product = create(:custom_product)
-      asset = Spree::Asset.create! { |a| a.viewable = product.master }
-
-      product.update_column(:updated_at,  1.day.ago)
-
-      expect do
-        asset.touch
-      end.to change { product.reload.updated_at }
-    end
-  end
-end