update paddle2onnx

test_tipc/configs/ppocr_det_mobile/model_linux_gpu_normal_normal_paddle2onnx_python_linux_cpu.txt

 ===========================paddle2onnx_params===========================
+model_name:ocr_det_mobile
+python:python3.7
 2onnx: paddle2onnx
 --model_dir:./inference/ch_ppocr_mobile_v2.0_det_infer/
 --model_filename:inference.pdmodel

test_tipc/configs/ppocr_det_server/model_linux_gpu_normal_normal_paddle2onnx_python_linux_cpu.txt

 ===========================paddle2onnx_params===========================
+model_name:ocr_det_server
+python:python3.7
 2onnx: paddle2onnx
 --model_dir:./inference/ch_ppocr_server_v2.0_det_infer/
 --model_filename:inference.pdmodel

test_tipc/configs/ppocr_rec_mobile/model_linux_gpu_normal_normal_paddle2onnx_python_linux_cpu.txt

 ===========================paddle2onnx_params===========================
+model_name:ocr_rec_mobile
+python:python3.7
 2onnx: paddle2onnx
 --model_dir:./inference/ch_ppocr_mobile_v2.0_rec_infer/
 --model_filename:inference.pdmodel

test_tipc/configs/ppocr_rec_server/model_linux_gpu_normal_normal_paddle2onnx_python_linux_cpu.txt

 ===========================paddle2onnx_params===========================
+model_name:ocr_rec_server
+python:python3.7
 2onnx: paddle2onnx
 --model_dir:./inference/ch_ppocr_server_v2.0_rec_infer/
 --model_filename:inference.pdmodel