fix: add forgotten override

Author: NiziL

applications/plugins/PersistentContact/PersistentFrictionContact.h

@@ -145,9 +145,9 @@ class PersistentFrictionContact : public FrictionContact<TCollisionModel1, TColl
 protected:
 
     /// Set the generic description of a contact point
-    void doSetDetectionOutputs(OutputVector* outputs);
+    void doSetDetectionOutputs(OutputVector* outputs) override;
 
-    void doCreateResponse(core::objectmodel::BaseContext* group);
+    void doCreateResponse(core::objectmodel::BaseContext* group) override;
 
     void doRemoveResponse() override;