[Cleanup] superfluouse semicolons and indentation

dune/solvers/norms/norm.hh

@@ -18,7 +18,7 @@ class Norm {
         using field_type =  typename Dune::FieldTraits<VectorType>::field_type;
 
         /** \brief Destructor, doing nothing */
-        virtual ~Norm() {};
+        virtual ~Norm() {}
 
         //! Compute the norm of the given vector
         virtual field_type operator()(const VectorType& f) const = 0;

dune/solvers/norms/twonorm.hh

@@ -18,7 +18,7 @@ class TwoNorm : public Norm<VectorType>
     public:
 
         /** \brief Destructor, doing nothing */
-        virtual ~TwoNorm() {};
+        virtual ~TwoNorm() {}
 
         //! Compute the norm of the given vector
         virtual double operator()(const VectorType& f) const