Members fails to boot when Consul is not available

There's a condition in the post-init that checks the initialization flag within Consul.  This currently is used to determine whether or not the member should be initialized as the primary or a standby.  This check is unnecessary after the initial setup.

https://github.com/fly-apps/postgres-flex/blob/master/internal/flypg/node.go#L221