Remove unused configuration setter

lib/dor/datastreams/workflow_definition_ds.rb

@@ -55,21 +55,13 @@ def repo
   end
 
   def configuration
-    result = ActiveSupport::OrderedHash.new
+    result = {}
     result['repository'] = repo
     result['name'] = name
     processes.each { |process| result[process.name] = process.to_hash }
     result
   end
 
-  def configuration=(hash)
-    self.ng_xml = Nokogiri::XML(%(<workflow-def id="#{hash['name']}" repository="#{hash['repository']}"/>))
-    i = 0
-    hash.each_pair do |k, v|
-      add_process(v.merge({:name => k, :sequence => i += 1})) if v.is_a?(Hash)
-    end
-  end
-
   # Creates the xml used by Dor::WorkflowService#create_workflow
   # @return [String] An object's initial workflow as defined by the <workflow-def> in content
   def initial_workflow