fix combined loss

ppocr/losses/combined_loss.py

@@ -53,7 +53,8 @@ class CombinedLoss(nn.Layer):
             for key in loss:
                 if key == "loss":
                     loss_all += loss[key] * weight
-                # else:
+                else:
+                    loss["{}_{}".format(key, idx)] = loss[key]
                     # loss[f"{key}_{idx}"] = loss[key]
             loss_dict.update(loss)
         loss_dict["loss"] = loss_all