signet: Fix uninitialized read in validation

Author: MarcoFalke

src/chainparams.cpp

@@ -326,6 +326,7 @@ class SigNetParams : public CChainParams {
         consensus.fPowNoRetargeting = false;
         consensus.nRuleChangeActivationThreshold = 1916;
         consensus.nMinerConfirmationWindow = 2016;
+        consensus.MinBIP9WarningHeight = 0;
         consensus.powLimit = uint256S("00000377ae000000000000000000000000000000000000000000000000000000");
         consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].bit = 28;
         consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nStartTime = 1199145601; // January 1, 2008