Use null as bind address if not specified

Author: lucko

src/main/java/me/lucko/luckperms/extension/rest/RestExtension.java

@@ -43,7 +43,7 @@ public RestExtension(LuckPerms luckPerms) {
     @Override
     public void load() {
         int port = RestConfig.getInteger("http.port", 8080);
-        String address = RestConfig.getString("http.address", "localhost");
+        String address = RestConfig.getString("http.address", null);
 
         Thread thread = Thread.currentThread();
         ClassLoader previousCtxClassLoader = thread.getContextClassLoader();

src/main/java/me/lucko/luckperms/extension/rest/RestServer.java

@@ -84,7 +84,7 @@ public RestServer(LuckPerms luckPerms, String address, int port) {
         this.setupErrorHandlers(this.app);
         this.routesClosable = this.setupRoutes(this.app, luckPerms);
 
-        LOGGER.info(String.format("[REST] Startup complete! Listening on http://%s:%d", address, port));
+        LOGGER.info("[REST] Startup complete! Listening on http://{}:{}", address == null ? "localhost" : address, port);
     }
 
     @Override