Fix stagnet/testnet mode

src/constants.cpp

@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright (c) 2020-2021, The Monero Project.
+
+#include "constants.h"
+
+namespace constants {
+    NetworkType::Type networkType = NetworkType::Type::MAINNET;
+};

src/constants.h

@@ -11,8 +11,7 @@
 
 namespace constants
 {
-    // application constants
-    static NetworkType::Type networkType; // TODO: compiler moans, also not really a const
+    extern NetworkType::Type networkType; // TODO: not really a const
 
     // coin constants
     const std::string coinName = "monero";