ClickOnCancel slot is virtual now to have possibility clear temporary structures when dialog is closed(PAL131191: EDF160 GEOM: in Glue Faces, visualize faces existing twice)

src/GEOMBase/GEOMBase_Skeleton.h

@@ -87,7 +87,7 @@ protected:
     QString myHelpFileName;
 
 protected slots:
-    void ClickOnCancel();
+    virtual void ClickOnCancel();
     void LineEditReturnPressed();
     void DeactivateActiveDialog();
     void ActivateThisDialog();