This test broke when PA_MAX_INPUTS_PER_SINK was increased from 32 to 256.
Because we currently don't have time to figure out why, let's just set
NSTREAMS to 20 in the meantime.
Signed-off-by: David Henningsson <david.henningsson@canonical.com>
When running two connect-stress tests at the same time the liklihood of >32 streams
per sink increases. All it takes is for an event sound to fire to trigger an abort of
the test.
This leaves just a little bit of wriggle room for a couple external streams.
Of course the overall problem is still there but this just makes it
slightly less likely without really affecting the test itself.
