Revert "rename User-Agent "

This reverts commit b685ad0.

Author: florida63

src/ping_thread.c

@@ -158,7 +158,7 @@ ping(void)
      */
     snprintf(request, sizeof(request) - 1,
              "GET %s%sgw_id=%s&sys_uptime=%lu&sys_memfree=%u&sys_load=%.2f&wifidog_uptime=%lu HTTP/1.0\r\n"
-             "User-Agent: WiFiDog-ffw %s\r\n"
+             "User-Agent: WiFiDog %s\r\n"
              "Host: %s\r\n"
              "\r\n",
              auth_server->authserv_path,