[Cleanup] Drop superfluous virtual, use override

src/state/ageinglawstateupdater.hh

@@ -11,10 +11,10 @@ class AgeingLawStateUpdater : public StateUpdater<ScalarVector, Vector> {
                         Dune::BitSetVector<1> const &_nodes, double _L,
                         double _V0);
 
-  void virtual nextTimeStep();
-  void virtual setup(double _tau);
-  void virtual solve(Vector const &velocity_field);
-  void virtual extractAlpha(ScalarVector &);
+  void nextTimeStep() override;
+  void setup(double _tau) override;
+  void solve(Vector const &velocity_field) override;
+  void extractAlpha(ScalarVector &) override;
 
 private:
   ScalarVector alpha_o;

src/state/sliplawstateupdater.hh

@@ -11,10 +11,10 @@ class SlipLawStateUpdater : public StateUpdater<ScalarVector, Vector> {
                       Dune::BitSetVector<1> const &_nodes, double _L,
                       double _V0);
 
-  void virtual nextTimeStep();
-  void virtual setup(double _tau);
-  void virtual solve(Vector const &velocity_field);
-  void virtual extractAlpha(ScalarVector &);
+  void nextTimeStep() override;
+  void setup(double _tau) override;
+  void solve(Vector const &velocity_field) override;
+  void extractAlpha(ScalarVector &) override;
 
 private:
   ScalarVector alpha_o;