[API Compatibility No.186] Keep target for torch.nn.functional.mse_loss in PaConvert -part

Author: Aidenwu0209

paconvert/api_mapping.json

@@ -9445,9 +9445,6 @@
       "reduce",
       "reduction"
     ],
-    "kwargs_change": {
-      "target": "label"
-    },
     "min_input_args": 2
   },
   "torch.nn.functional.multi_margin_loss": {