Fixed ovewrite of supressProjectJsonWarning

Author: Sidney Andrews

package.json

@@ -612,6 +612,11 @@
           "default": false,
           "description": "Suppress the notification window to perform a 'dotnet restore' when dependencies can't be resolved."
         },
+        "csharp.suppressProjectJsonWarning": {
+          "type": "boolean",
+          "default": false,
+          "description": "Suppress the warning that project.json is no longer a supported project format for .NET Core applications"
+        },
         "csharp.supressBuildAssetsNotification": {
           "type": "boolean",
           "default": false,