Make channelpadding_update_padding_for_channel() use !channel_is_client()
Because we need to include all relays, even if they are flapping in the consensus:
// We should not allow malicious relays to disable or reduce padding for
// us as clients. In fact, we should only accept this cell at all if we're
// operating as a relay. Bridges should not accept it from relays, either
// (only from their clients).
if ((get_options()->BridgeRelay &&
connection_or_digest_is_known_relay(chan->identity_digest)) ||
!get_options()->ORPort_set) {We should also use !server_mode() rather than !ORPort_set.
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