bugfix: regtest segwit start time 0

The deployments are written to and read
from a database and the start time is
a U32. Changing the value to -1 will cause
the value to be read incorrectly and cause
the tests to fail.

lib/blockchain/chain.js

@@ -2389,9 +2389,6 @@ class Chain extends AsyncEmitter {
   async getState(prev, deployment) {
     const bit = deployment.bit;
 
-    if (deployment.startTime === -1)
-      return thresholdStates.ACTIVE;
-
     let window = this.network.minerWindow;
     let threshold = this.network.activationThreshold;
 

lib/protocol/networks.js

@@ -801,7 +801,7 @@ regtest.deployments = {
   segwit: {
     name: 'segwit',
     bit: 1,
-    startTime: -1,
+    startTime: 0,
     timeout: 0xffffffff,
     threshold: -1,
     window: -1,