Update mapgen params in ServerMap after Mapgen init

src/map.h

@@ -496,6 +496,7 @@ public:
 	u64 getSeed(){ return m_seed; }
 
 	MapgenParams *getMapgenParams(){ return m_mgparams; }
+	void setMapgenParams(MapgenParams *mgparams){ m_mgparams = mgparams; }
 
 	// Parameters fed to the Mapgen
 	MapgenParams *m_mgparams;

src/server.cpp

@@ -823,6 +823,7 @@ Server::Server(
 	
 	// Initialize mapgens
 	m_emerge->initMapgens(mgparams);
+	servermap->setMapgenParams(m_emerge->params);
 
 	// Give environment reference to scripting api
 	m_script->initializeEnvironment(m_env);