remove misleading mutable field

@@ -19,7 +19,8 @@ import static org.legrog.util.H2ConsoleServlet.CONSOLE_MAPPING;
 )
 public class H2ConsoleServlet extends org.h2.server.web.WebServlet {
     static final String CONSOLE_MAPPING = "/console/*";
-    private Logger logger = LoggerFactory.getLogger(getClass());
+
+    static final Logger logger = LoggerFactory.getLogger(H2ConsoleServlet.class);
 
     @Override
     public void init() {