Fix create block using wrong protocol schedule when parent is genesis (#4986)

Signed-off-by: Jason Frame <jason.frame@consensys.net>

ethereum/blockcreation/src/main/java/org/hyperledger/besu/ethereum/blockcreation/AbstractBlockCreator.java

@@ -158,6 +158,7 @@ public abstract class AbstractBlockCreator implements AsyncBlockCreator {
               BlockHeaderBuilder.fromHeader(parentHeader)
                   .number(parentHeader.getNumber() + 1)
                   .timestamp(timestamp)
+                  .parentHash(parentHeader.getHash())
                   .blockHeaderFunctions(new MainnetBlockHeaderFunctions())
                   .buildBlockHeader());