Add icone for a work order

git-svn-id: http://svn.code.sf.net/p/itop/code/trunk@2527 a333f486-631f-4898-b8df-5754b55c2be0

datamodels/2.x/itop-tickets/datamodel.itop-tickets.xml

@@ -457,6 +457,7 @@
           </attributes>
         </naming>
         <display_template/>
+        <icon>images/workorder.png</icon>
         <icon/>
         <reconciliation>
           <attributes>