corrected the formal subject of ExistsNP in Fre

src/french/ExtendFre.gf

@@ -161,7 +161,7 @@ lin UseDAP = \dap ->
       } ;
 
     ExistsNP np =
-      mkClause [] True False np.a
+      mkClause "il" True False np.a
       (insertComplement (\\_ => (np.s ! Nom).ton)
          (predV (mkV "exister"))) ;