fix nullpointer in rulecommandhandler

rt-key/src/main/java/edu/kit/iti/formal/psdbg/interpreter/funchdl/RuleCommandHandler.java

@@ -77,7 +77,7 @@ public class RuleCommandHandler implements CommandHandler<KeyData> {
         try {
             for (SequentFormula sf : g.node().sequent().succedent()) {
                 ImmutableList<TacletApp> apps = index.getTacletAppAtAndBelow(filter,
-                        new PosInOccurrence(sf, PosInTerm.getTopLevel(), true),
+                        new PosInOccurrence(sf, PosInTerm.getTopLevel(), false),
                         services);
                 apps.forEach(t -> set.add(t.taclet().name().toString()));
             }