Fix typo in identifier of PerceptualNetworkType

Fixup the identifier's, not just the string's typo from medical_* to medicalnet_* to conform to Warvito's hubconf.py in the MedicalNet repo.

Signed-off-by: Fabian Klopfer <fabian.klopfer@ieee.org>

Author: SomeUserName1

monai/losses/perceptual.py

@@ -29,7 +29,7 @@ class PercetualNetworkType(StrEnum):
     squeeze = "squeeze"
     radimagenet_resnet50 = "radimagenet_resnet50"
     medicalnet_resnet10_23datasets = "medicalnet_resnet10_23datasets"
-    medical_resnet50_23datasets = "medicalnet_resnet50_23datasets"
+    medicalnet_resnet50_23datasets = "medicalnet_resnet50_23datasets"
     resnet50 = "resnet50"