message: [Tests] Set nStakeMinDepth to 2
  so stakeinputs must at least be on chain
diff: @@ -404,7 +404,7 @@ public:
  consensus.nPoolMaxTransactions = 2;
  consensus.nProposalEstablishmentTime = 60 * 5; // at least 5 min old to make it into a budget
  consensus.nStakeMinAge = 0;
  - consensus.nStakeMinDepth = 0;
  + consensus.nStakeMinDepth = 2;
  consensus.nTargetTimespan = 40 * 60;
  consensus.nTargetTimespanV2 = 30 * 60;
  consensus.nTargetSpacing = 1 * 60;
  