fix redundant storage of current date both in wxCalendarCtrl (which was itself redundantly stored as both wxDatePickerCtrl::m_cal and m_popup) and popup m_currentDate variable which resulted in multiple bugs, e.g. calendar didn't open at the current date value

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@51843 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/datectrl.h

@@ -59,7 +59,7 @@ public:
 
     // extra methods available only in this (generic) implementation
     bool SetFormat(const wxString& fmt);
-    wxCalendarCtrl *GetCalendar() const { return m_cal; }
+    wxCalendarCtrl *GetCalendar() const;
 
 
     // implementation only from now on
@@ -78,7 +78,6 @@ private:
     void OnSize(wxSizeEvent& event);
     void OnFocus(wxFocusEvent& event);
 
-    wxCalendarCtrl *m_cal;
     wxComboCtrl* m_combo;
     wxCalendarComboPopup* m_popup;