Remove unneeded check of closed channel.
Remove unneeded check of closed channel.

jrick/btcwallet,jrick/btcwallet,synrg-labs/btcwallet,decred/dcrwallet,Stash-Crypto/btcwallet,synrg-labs/btcwallet,Roasbeef/btcwallet,btcsuite/btcwallet,Stash-Crypto/btcwallet,btcsuite/btcwallet,jrick/dcrwallet,Roasbeef/btcwallet,decred/dcrwallet,jrick/dcrwallet