Change enum modeling

Author: olterner-ms

specification/applicationinsights/resource-manager/Microsoft.Insights/preview/2020-03-01-preview/componentLinkedStorageAccounts_API.json

@@ -287,7 +287,7 @@
       ],
       "x-ms-enum": {
         "name": "StorageType",
-        "modelAsString": false
+        "modelAsString": true
       },
       "description": "The type of the Application Insights component data source for the linked storage account.",
       "x-ms-parameter-location": "method"