More border rationalisation. GetDefaultBorder is now mostly defined in base class files.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@49893 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/motif/tglbtn.h

@@ -37,6 +37,10 @@ public:
                  long style = 0,
                  const wxValidator& val = wxDefaultValidator,
                  const wxString &name = wxCheckBoxNameStr );
+
+protected:
+    virtual wxBorder GetDefaultBorder() const { return wxBORDER_NONE; }
+
 private:
     DECLARE_DYNAMIC_CLASS(wxToggleButton)