STA: the artificial livelock state becomes the first successor

* src/taalgos/tgba2ta.cc: improves the STA (Single-pass TA) by adding
the  artificial livelock state as the first successor.

src/taalgos/tgba2ta.cc

@@ -271,7 +271,7 @@ namespace spot
               {
 
                 testing_automata->create_transition(source, (*it_conditions),
-                    bddfalse, artificial_livelock_accepting_state);
+                    bddfalse, artificial_livelock_accepting_state,true);
 
               }
           }