Update program.py

PaddleOCR/tools/program.py的第254行的变量名原为cur_metirc，需要修改为cur_metric，如果不修改在运行是，会提示
The variable name of line 254 can be changed to cur_ Metric. If you do not modify it, you will be prompted when it is running
"E:\XXX\PaddleOCR\tools\program.py", line 257, in train
    ['{}: {}'.format(k, v) for k, v in cur_metric.items()]))
NameError: name 'cur_metric' is not defined

tools/program.py

@@ -251,7 +251,7 @@ def train(config,
                         min_average_window=10000,
                         max_average_window=15625)
                     Model_Average.apply()
-                cur_metirc = eval(model, valid_dataloader, post_process_class,
+                cur_metric = eval(model, valid_dataloader, post_process_class, #  原cur_metirc修改为 cur_metric
                                   eval_class)
                 cur_metric_str = 'cur metric, {}'.format(', '.join(
                     ['{}: {}'.format(k, v) for k, v in cur_metric.items()]))