Hidde unused attribute end end in the search form

git-svn-id: http://svn.code.sf.net/p/itop/code/trunk@2934 a333f486-631f-4898-b8df-5754b55c2be0

datamodels/2.x/itop-request-mgmt/datamodel.itop-request-mgmt.xml

@@ -2177,9 +2177,6 @@
             <item id="start_date">
               <rank>50</rank>
             </item>
-            <item id="end_date">
-              <rank>60</rank>
-            </item>
             <item id="resolution_date">
               <rank>70</rank>
             </item>