test(e2e): Change deadlock timeout to default (#3874)

This was occasionally causing some flaky behavior in tests. Removing this setting to use the default timeout value.

enos/modules/docker_postgres/postgresql.conf

@@ -3,7 +3,6 @@ max_connections            = 100
 work_mem                   = 50000kB
 shared_buffers             = 64MB
 log_destination            = 'stderr'
-deadlock_timeout           = 100
 log_min_messages           = info
 log_min_error_statement    = error
 log_error_verbosity        = verbose