修复推送报错:确定为服务端没有安装webman/push扩展，移除冗余代码

config/plugin/webman/push/process.php

@@ -1,10 +1,10 @@
 <?php
 
-use app\process\WebmanPushServer;
+use Webman\Push\Server;
 
 return [
     'server' => [
-        'handler'     => WebmanPushServer::class,
+        'handler'     => Server::class,
         'listen'      => config('plugin.webman.push.app.websocket'),
         'count'       => 1, // 必须是1
         'reloadable'  => false, // 执行reload不重启