Don't destroy the HICON returned by SHDefExtractIcon() twice

Surprisingly, this doesn't seem to result in any ill effects, but
passing HICON to wxIcon already ensures that this HICON will be
destroyed in wxIcon dtor, so we shouldn't call ::DestroyIcon() on it
manually.

src/msw/artmsw.cpp

@@ -101,10 +101,7 @@ MSWGetBitmapFromIconLocation(const TCHAR* path, int index, const wxSize& size)
     if ( !icon.InitFromHICON((WXHICON)hIcon, size.x, size.x) )
         return wxNullBitmap;
 
-    wxBitmap bitmap(icon);
-    ::DestroyIcon(hIcon);
-
-    return bitmap;
+    return wxBitmap(icon);
 }
 
 wxBitmap