validation: Add missing mempool locks

src/rpc/mining.cpp

@@ -469,7 +469,7 @@ static UniValue getblocktemplate(const JSONRPCRequest& request)
             nTransactionsUpdatedLastLP = nTransactionsUpdatedLast;
         }
 
-        // Release the wallet and main lock while waiting
+        // Release lock while waiting
         LEAVE_CRITICAL_SECTION(cs_main);
         {
             checktxtime = std::chrono::steady_clock::now() + std::chrono::minutes(1);