remove USE_UPDATED_TEMPLATES flag now that 'templates-sdk-dev' is the default template in 'template-sdk', as per: https://googleplex-android-review.git.corp.google.com/#/c/1407762/1 am: c7db864254
am: 30d8b5b1ad

Change-Id: If8d7d04ae24e89c3d655ffe586021e549504c183