REGTESTS: peers: leave a bit more time to peers to synchronize

tls_basic_sync_wo_stkt_backend fails once every 200 runs for me. This
seems to be because the startup delay doesn't always allow peers to
perform a simultaneous connect, close and new attempt. With 3s I can't
see it fail anymore. In addition the long "delay 0.2" are still way too
much since we do not really care about the startup order in practice.
1 file changed