Always use original_url in slice media tasks

app/models/tasks/copy_media_task.rb

@@ -6,7 +6,11 @@ def media_resource
   end
 
   def source_url
-    media_resource&.href
+    if media_resource&.slice?
+      media_resource.original_url
+    else
+      media_resource&.href
+    end
   end
 
   def porter_tasks

test/models/tasks/copy_media_task_test.rb

@@ -9,6 +9,17 @@
         assert_equal "whatev", task.source_url
       end
     end
+
+    it "is always the original url for sliced segments" do
+      task.media_resource.segmentation = [1.23, 4.56]
+      task.media_resource.original_url = "http://some.where"
+
+      assert task.media_resource.slice?
+
+      task.media_resource.stub(:href, "http://else.where") do
+        assert_equal "http://some.where", task.source_url
+      end
+    end
   end
 
   describe "#porter_tasks" do