xscreensaver: Fix SHA256 hash of upstream tarball.

The upstream tarball has changed, so I checked why this has happened and
found a tarball with the old SHA256 hash here:

http://fossies.org/linux/misc/xscreensaver-5.33.tar.gz/



After checking the contents of this and the new upstream tarball I found
that the old tarball had only .so, .o and .o.d files which now are no
longer existent in the new tarball.

Seems that the upstream author has accidentally put object files in the
source tarball and has now corrected this mistake.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>