CRM-21201, set retrieve = true so that its not reinitialized again an…

…d just want the DataTable instance to be returned

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* CRM-21201: Tax recalculated when pay later contribution is compled using Pay Now
  https://issues.civicrm.org/jira/browse/CRM-21201

templates/CRM/Contact/Page/DedupeFind.tpl

@@ -180,6 +180,7 @@
       "ajax": {
         "url": {/literal}'{$sourceUrl}'{literal}
       },
+      "retrieve": true,
       rowCallback: function (row, data) {
         // Set the checked state of the checkbox in the table
         $('input.crm-dedupe-select', row).prop('checked', data.is_selected == 1);