Remove old TODO comment.
Remove old TODO comment.

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