Notify connected ws clients of btcd connect state.
Notify connected ws clients of btcd connect state.

This shouldn't be nececssary (a TODO was added to remind me to make
clients explicitly ask for this info) but in the meantime this fixes
clients such as btcgui which otherwise wouldn't think btcwallet is
properly connected to btcd and will desensitise some widgets.

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