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

src/os2/cursor.cpp

@@ -113,7 +113,7 @@ wxCursor::wxCursor( const wxString& WXUNUSED(rsCursorFile),
 } // end of wxCursor::wxCursor
 
 // Cursors by stock number
-wxCursor::wxCursor(int nCursorType)
+wxCursor::wxCursor(wxStockCursor nCursorType)
 {
     wxCursorRefData*                pRefData = new wxCursorRefData;