use wxStockCursor (as documented and as already implemented in wxMotif) instead of a plain 'int'

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@55837 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/cocoa/cursor.h

@@ -46,7 +46,7 @@ public:
     wxCursor(const wxString& name, long flags = 0,
              int hotSpotX = 0, int hotSpotY = 0);
 
-    wxCursor(int cursor_type);
+    wxCursor(wxStockCursor cursor_type);
     virtual ~wxCursor();
 
     // FIXME: operator==() is wrong!