Use provided localFctOrder of nonneg.

amdis/Integrate.hpp

@@ -29,8 +29,9 @@ namespace AMDiS
 
     using LF = TYPEOF(localFct);
     auto quadOrder = [localFctOrder](auto const& lf) {
-      DUNE_UNUSED_PARAMETER(localFctOrder);
-      if constexpr(Concepts::Polynomial<LF>)
+      if (localFctOrder >= 0)
+        return localFctOrder;
+      else if constexpr(Concepts::Polynomial<LF>)
         return order(lf);
       else
         return localFctOrder;