Tolerate only one error during ntp sync
Tolerate only one error during ntp sync

Previously we were doing 5 concurrent requests, thus it was
safe to tolerate 2 errors. With 4 it doesn't make sense to use
only 2 responses, because even if 1 of them is skewed - we will set
incorrect time.

status-im/status-go,status-im/status-go,status-im/status-go