fix: add forgotten override

Co-authored-by: Damien Marchal <damien.marchal@univ-lille1.fr>

Author: NiziL

applications/plugins/PersistentContact/PersistentFrictionContact.h

@@ -149,7 +149,7 @@ class PersistentFrictionContact : public FrictionContact<TCollisionModel1, TColl
 
     void doCreateResponse(core::objectmodel::BaseContext* group);
 
-    virtual void doRemoveResponse();
+    void doRemoveResponse() override;
 
     std::pair<bool,bool> findMappingOrUseMapper();