tests/examples/seek/seek.c: Stop the scale updater when we start grabing the slider. Don't wait for the pipeline to b...

Original commit message from CVS:
2006-10-13  Julien MOUTTE  <julien@moutte.net>

* tests/examples/seek/seek.c: (do_seek), (start_seek),
(rate_spinbutton_changed_cb), (msg_state_changed): Stop the
scale
updater when we start grabing the slider. Don't wait for the
pipeline to be PAUSED.