Close the JSON object in settings.json (microsoft#17583)

### Description

This patch adds a closing curly bracket at the end of `settings.json`.

### Motivation and Context

`settings.json` is just not closed. It was accidentally removed at
4e6ea73

.vscode/settings.json

@@ -40,3 +40,4 @@
         "-build/include_subdir",
         "-runtime/references"
     ]
+}