trade: set order_report_document_portal_type request key for listbox title

This report uses a generic listbox with a TALES to read in request its
title. This request key is not set by PackingListModule_viewPackingListReportDialog
but we can find a good default from module name.

bt5/erp5_trade/SkinTemplateItem/portal_skins/erp5_trade/OrderModule_getOrderReportParameterDict.py

@@ -31,6 +31,9 @@ elif request.get('order_report_document_portal_type'):
 else:
   raise ValueError("unknown type for report")
 
+if not request.get('order_report_document_portal_type'):
+  request.set('order_report_document_portal_type', doc_portal_type)
+
 selection_columns = [('group_by', "Group by")]
 if from_date is None:
   # get the minimum start date in catalog