fix the path

it is only a example, the probleams appear the files in the config folder.The path dose not fix for the windows  system ,at the same ,we should use the relativte path instead of absoulate path.

configs/rec/rec_icdar15_train.yml

@@ -15,8 +15,8 @@ Global:
   loss_type: ctc
   distort: true
   debug: false
-  reader_yml: ./configs/rec/rec_icdar15_reader.yml
-  pretrain_weights: ./pretrain_models/rec_mv3_none_bilstm_ctc/best_accuracy
+  reader_yml: ../configs/rec/rec_icdar15_reader.yml
+  pretrain_weights: ../pretrain_models/rec_mv3_none_bilstm_ctc/best_accuracy
   checkpoints:
   save_inference_dir:
   infer_img: