Removed undefined method from GridEntity

src/TNL/Meshes/GridEntity.h

@@ -113,9 +113,6 @@ class GridEntity< Meshes::Grid< Dimensions, Real, Device, Index >, EntityDimensi
       __cuda_callable__ inline
       const EntityBasisType& getBasis() const;
  
-      __cuda_callable__ inline
-      EntityBasisType& getBasis();
- 
       __cuda_callable__ inline
       void setBasis( const EntityBasisType& basis );