wsim: Switch off heartbeat by default

For reasons I haven't completely fathomed, adding a heartbeat per frame
is upsetting the qd-balancer when run with just a single client, e.g.
./gem_wsim -n 341724 -w wsim/media_mfe2_480p.wsim -c 1 -r 100 -b 1

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
1 file changed