Disable coinbase-must-be-protected rule on regtest.

src/consensus/params.h

@@ -14,6 +14,9 @@ namespace Consensus {
  */
 struct Params {
     uint256 hashGenesisBlock;
+
+    bool coinbaseMustBeProtected;
+
     /** Needs to evenly divide MAX_SUBSIDY to avoid rounding errors. */
     int nSubsidySlowStartInterval;
     /**