add missed offline_access

[zgf]

without offline_access, the result won't return refresh token

[opbld32]

Docs Build status updates of commit 43d98e4:

:x: Validation status: errors

Please follow instructions here which may help to resolve issue.

File	Status	Preview URL	Details
[]()	:x:Error		Details

• [Error-InsufficientPermissionOnRepo] User eric-urban does not have sufficient permission on https://github.com/MicrosoftDocs/Advertising-docs repository. Hint: required permission 'Read', actual permission 'None'.

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[eric-urban]

Merged in another PR to unblock. I'll investigate the validation errors next week.