[spaces.cg.fem] update mapper

dune/gdt/spaces/continuouslagrange/fem.hh

@@ -64,7 +64,7 @@ private:
 
 public:
   typedef Dune::Fem::LagrangeDiscreteFunctionSpace<FunctionSpaceType, GridPartType, polOrder> BackendType;
-  typedef Mapper::FemDofWrapper<typename BackendType::BlockMapperType> MapperType;
+  typedef Mapper::FemDofWrapper<typename BackendType::BlockMapperType, 1> MapperType;
   typedef typename GridPartType::template Codim<0>::EntityType EntityType;
   typedef BaseFunctionSet::FemWrapper<typename BackendType::ShapeFunctionSetType, EntityType, DomainFieldType,
                                       dimDomain, RangeFieldType, dimRange, dimRangeCols> BaseFunctionSetType;
@@ -169,7 +169,7 @@ public:
 private:
   std::shared_ptr<const GridPartType> gridPart_;
   std::shared_ptr<const GridViewType> gridView_;
-  std::shared_ptr<const BackendType> backend_;
+  std::shared_ptr<BackendType> backend_;
   std::shared_ptr<const MapperType> mapper_;
   mutable double communicator_;
 }; // class FemBased< ..., 1 >