miner: Pass in blockman to ::RegenerateCommitments

REQUIRES ATTENTION

src/rpc/mining.cpp

@@ -369,7 +369,7 @@ static RPCHelpMan generateblock()
 
     // Add transactions
     block.vtx.insert(block.vtx.end(), txs.begin(), txs.end());
-    RegenerateCommitments(block);
+    RegenerateCommitments(block, WITH_LOCK(::cs_main, return std::ref(g_chainman.m_blockman)));
 
     {
         LOCK(cs_main);