Updated default name from Isolate-MDEMachine to Unisolate-MDEMachine (#4587)

Updated default name from Isolate-MDEMachine to Unisolate-MDEMachine
Possible fix for #4556

Playbooks/Unisolate-MDEMachine/incident-trigger/azuredeploy.json

@@ -17,7 +17,7 @@
     },
     "parameters": {
         "PlaybookName": {
-            "defaultValue": "Isolate-MDEMachine",
+            "defaultValue": "Unisolate-MDEMachine",
             "type": "string"
         }
     },
@@ -235,4 +235,4 @@
             }
         }
     ]
-}
+}