Replace 3 copies of wxListCtrl mode tests with a single one in wxListCtrlBase.

Move InReportView() and IsVirtual() into the base class as they were the same
in all the implementations.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70281 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/listctrl.h

@@ -140,12 +140,6 @@ public:
     bool ScrollList( int dx, int dy );
     bool SortItems( wxListCtrlCompare fn, wxIntPtr data );
 
-    // are we in report mode?
-    bool InReportView() const { return HasFlag(wxLC_REPORT); }
-
-    // are we in virtual report mode?
-    bool IsVirtual() const { return HasFlag(wxLC_VIRTUAL); }
-
     // do we have a header window?
     bool HasHeader() const
         { return InReportView() && !HasFlag(wxLC_NO_HEADER); }