[BUG FIX][X86 Demo] Fix the issue that x86 light_api_demo can not operate successfully (!3529) · 合并请求 · PaddlePaddle / Paddle-Lite

[BUG FIX][X86 Demo] Fix the issue that x86 light_api_demo can not operate successfully !3529

Created by: DannyIsFunny

【问题描述】x86 light_api_demo无法正常运行【问题定位】demo中使用了2.3版本之前的老接口，导致无法加载2.3之后版本的新格式的模型【本PR工作】替换为新接口，测试light_api_demo正常运行