8249: Remove trailing commas in profiles.schema.json (#8257)

Fixes https parsing of the latest version of `profiles.schema.json`, particularly by VS Code Intellisense.

* [x] Closes #8249 

The VS Code parsing warning below is a known and unrelated existing issue due to VS Code only supporting JSON Schema Draft 7. It does not prevent Intellisense from functioning.

> Draft 2019-09 schemas are not yet fully supported.

## Validation Steps Performed

Manually tested and successfully validated by fixing a local copy of `profiles.schema.json` and defining it as `$schema` in `settings.json`

Author: xiiok

doc/cascadia/profiles.schema.json

@@ -694,7 +694,7 @@
               "enum": [
                 "mru",
                 "inOrder",
-                "disabled",
+                "disabled"
               ],
               "type": "string"
             }
@@ -712,7 +712,7 @@
               "enum": [
                 "mru",
                 "inOrder",
-                "disabled",
+                "disabled"
               ],
               "type": "string"
             }