Don't override Refresh() in wxStatusBar under wxQt

This is not necessary and, more importantly, results in a crash if you try
to recreate the status bar (which can be seen in the statbar example)

Also remove leftover QList declaration

include/wx/qt/statusbar.h

@@ -13,8 +13,6 @@
 class QLabel;
 class QStatusBar;
 
-template < class T > class QList;
-
 class WXDLLIMPEXP_CORE wxStatusBar : public wxStatusBarBase
 {
 public:
@@ -31,8 +29,6 @@ public:
     virtual void SetMinHeight(int height) override;
     virtual int GetBorderX() const override;
     virtual int GetBorderY() const override;
-    virtual void Refresh( bool eraseBackground = true,
-                          const wxRect *rect = nullptr ) override;
 
     QStatusBar *GetQStatusBar() const { return m_qtStatusBar; }
     QWidget *GetHandle() const override;

src/qt/statusbar.cpp

@@ -94,14 +94,6 @@ void wxStatusBar::DoUpdateStatusText(int number)
     m_qtPanes[number]->setText( wxQtConvertString( m_panes[number].GetText() ) );
 }
 
-// Called each time number/size of panes changes
-void wxStatusBar::Refresh( bool eraseBackground, const wxRect *rect )
-{
-    UpdateFields();
-
-    wxWindow::Refresh( eraseBackground, rect );
-}
-
 void wxStatusBar::Init()
 {
     m_qtStatusBar = nullptr;