tests/examples/seek/seek.c: Increase the range of the rate selector as I would like to test QOS behavior at higher fo...

Original commit message from CVS:
2007-11-24  Julien MOUTTE  <julien@moutte.net>

* tests/examples/seek/seek.c: (main): Increase the range of the
rate selector as I would like to test QOS behavior at higher
forward and reverse playback speed like say 64x.