Unreliable ClientRpc is not mapping to UnreliableRpc channel when running as a Host

[0xFA11]

Describe the bug
If we invoke a [ClientRpc(Delivery = RpcDelivery.Unreliable)], it should be sent over NetworkChannel.UnreliableRpc but it's being sent over NetworkChannel.ReliableRpc.
This bug happens only if we're running as a Host and trying to invoke an Unreliable ClientRpc.

Environment:
occurs on Windows, macOS on 2019.4 and 2020.3 under the latest release/0.1.0 branch (39604a3)

[0xFA11]

fixed by #638