fix getLocks and wallet zapping.

lib/bcoin/chain.js

@@ -2036,7 +2036,7 @@ Chain.prototype.getLocks = function getLocks(tx, flags, entry, callback) {
       return next();
 
     coinHeight = input.coin.height === -1
-      ? self.chain.tip + 1
+      ? self.height + 1
       : input.coin.height;
 
     if ((input.sequence & typeFlag) === 0) {

lib/bcoin/txdb.js

@@ -1794,6 +1794,8 @@ TXPool.prototype.zap = function zap(address, now, age, callback, force) {
         return callback(err);
 
       utils.forEachSerial(txs, function(tx, next) {
+        if (tx.ts !== 0)
+          return next();
         self.lazyRemove(tx, next);
       }, callback);
     });