remove duplicated code

Most probably not intended when introduced
in 7c7267e8, and it certainly crashes xray
installation for me.

Change-Id: Ida64d4d2a706204989fc3c16d7487748747fb8fc

xmlscript/source/xmldlg_imexp/xmldlg_impmodels.cxx

@@ -1627,7 +1627,6 @@ void CheckBoxElement::endElement()
         xControlModel->setPropertyValue( "State", makeAny( nVal ) );
     }
 
-    ctx.importEvents( _events );
     ctx.importEvents( _events );
     // avoid ring-reference:
     // vector< event elements > holding event elements holding this (via _pParent)