DeactivatePage's pSet param cannot be defaulted anyway

...because SfxTabPage inherits zero-param TabPage::DeactivatePage

Change-Id: I6eeb2e75b0d28d54d57e38494330e667e1013a27

include/sfx2/tabdlg.hxx

@@ -257,7 +257,7 @@ public:
         using TabPage::ActivatePage;
         using TabPage::DeactivatePage;
     virtual void            ActivatePage( const SfxItemSet& );
-    virtual sfxpg           DeactivatePage( SfxItemSet* pSet = 0 );
+    virtual sfxpg           DeactivatePage( SfxItemSet* pSet );
     void                    SetUserData(const OUString& rString)
                               { aUserString = rString; }
     OUString                GetUserData() { return aUserString; }