Use ParamsWrapper for witness serialization

src/node/interfaces.cpp

@@ -775,7 +775,7 @@ public:
     {
         RPCRunLater(name, std::move(fn), seconds);
     }
-    int rpcSerializationFlags() override { return RPCSerializationFlags(); }
+    bool rpcSerializationWithoutWitness() override { return RPCSerializationWithoutWitness(); }
     common::SettingsValue getSetting(const std::string& name) override
     {
         return args().GetSetting(name);