[PSDK] Correct addParameter() uri default value too. CORE-10320

svn path=/trunk/; revision=69472

reactos/include/psdk/msxml2.idl

@@ -1286,7 +1286,7 @@ interface IXSLProcessor : IDispatch
     HRESULT addParameter(
         [in] BSTR p, 
         [in] VARIANT var, 
-        [in, defaultvalue("")] BSTR uri);
+        [in, defaultvalue(L"")] BSTR uri);
 
     [id(DISPID_XMLDOM_PROCESSOR_ADDOBJECT)]
     HRESULT addObject(