fix(settings): Fix type predicate for scopes filter

Use NonNullable<typeof v> instead of string since the array contains
Scope (a string literal union), not plain string.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: priscilawebdev

static/app/views/settings/account/apiNewToken.tsx

@@ -90,7 +90,7 @@ export default function ApiNewToken() {
         data: {
           ...data,
           scopes: permissionStateToList(permissions).filter(
-            (v): v is string => v !== undefined
+            (v): v is NonNullable<typeof v> => v !== undefined
           ),
         },
       }),