Fixed confusing lower and upper result bounds for minimizing properties.

src/storm-pomdp/modelchecker/ApproximatePOMDPModelchecker.cpp

@@ -305,8 +305,12 @@ namespace storm {
                     ++refinementCounter;
                 }
                 statistics.refinementSteps = refinementCounter;
+                if (min) {
+                    return std::make_unique<POMDPCheckResult<ValueType>>(POMDPCheckResult<ValueType>{res->underApproxValue, res->overApproxValue});
+                } else {
                     return std::make_unique<POMDPCheckResult<ValueType>>(POMDPCheckResult<ValueType>{res->overApproxValue, res->underApproxValue});
                 }
+            }
 
             template<typename ValueType, typename RewardModelType>
             std::unique_ptr<POMDPCheckResult<ValueType>>
@@ -322,8 +326,12 @@ namespace storm {
                 if (result == nullptr) {
                     return nullptr;
                 }
+                if (min) {
+                    return std::make_unique<POMDPCheckResult<ValueType>>(POMDPCheckResult<ValueType>{result->underApproxValue, result->overApproxValue});
+                } else {
                     return std::make_unique<POMDPCheckResult<ValueType>>(POMDPCheckResult<ValueType>{result->overApproxValue, result->underApproxValue});
                 }
+            }