Move pblocktree global to BlockManager

src/init.cpp

@@ -264,7 +264,6 @@ void Shutdown(NodeContext& node)
                 chainstate->ResetCoinsViews();
             }
         }
-        pblocktree.reset();
     }
     for (const auto& client : node.chain_clients) {
         client->stop();
@@ -1355,6 +1354,7 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
 
                 UnloadBlockIndex(node.mempool.get(), chainman);
 
+                auto& pblocktree{chainman.m_blockman.m_block_tree_db};
                 // new CBlockTreeDB tries to delete the existing file, which
                 // fails if it's still open from the previous loop. Close it first:
                 pblocktree.reset();