let MDP helper return type store choiceValues

src/storm/modelchecker/prctl/helper/MDPModelCheckingHelperReturnType.h

@@ -29,6 +29,9 @@ namespace storm {
                 // The values computed for the states.
                 std::vector<ValueType> values;
 
+                // The values computed for the available choices.
+                std::vector<ValueType> choiceValues;
+
                 // A scheduler, if it was computed.
                 std::unique_ptr<storm::storage::Scheduler<ValueType>> scheduler;
             };