Remove default so that the API becomes patchable

Author: Anupam Srivastava

specification/cdn/resource-manager/Microsoft.Cdn/preview/2024-06-01-preview/afdx.json

@@ -6758,7 +6758,6 @@
           "description": "Threshold at which additional backends are added for capacity based load balancing. Default is 80.",
           "type": "integer",
           "format": "int32",
-          "default": 80,
           "maximum": 100,
           "minimum": 20
         },
@@ -6772,8 +6771,7 @@
           "x-ms-enum": {
             "name": "DistributionType",
             "modelAsString": false
-          },
-          "default": "DynamicWeights"
+          }
         }
       }
     },