Don't attempt tx resend if unmined in a new block.

Any and all resending should be handled directly by btcd, and btcd
ignores any duplicate transactions when adding to mempool anyways.  A
set of unmined txs is still kept and send to btcd in case of btcd
restarting and losing wallet transactions from its mempool.

sockets.go

@@ -389,10 +389,6 @@ func NtfnBlockConnected(r interface{}) {
 	for _, txid := range minedTxs {
 		delete(UnminedTxs.m, txid)
 	}
-
-	// Resend any remaining transactions still left in pool.  These are
-	// transactions that have not yet been mined into a block.
-	resendUnminedTxs()
 	UnminedTxs.Unlock()
 }