Apply some fixes to server destruction order

was broken by bc4ab8b99e

src/server.cpp

@@ -393,6 +393,10 @@ Server::~Server()
 		infostream << "Server: Saving environment metadata" << std::endl;
 		m_env->saveMeta();
 
+		// Delete classes that depend on the environment
+		m_inventory_mgr.reset();
+		m_script.reset();
+
 		// Note that this also deletes and saves the map.
 		delete m_env;
 		m_env = nullptr;
@@ -409,6 +413,9 @@ Server::~Server()
 		}
 	}
 
+	// emerge may depend on definition managers, so destroy first
+	m_emerge.reset();
+
 	// Delete the rest in the reverse order of creation
 	delete m_game_settings;
 	delete m_banmanager;