Cleanup the duo_pro_trial_expired_widget ff

Serhii Yarynovskyirequested to merge
478735-clean-up-duo-pro-trial-expired-widget-ff into master

What does this MR do and why?

Cleanup the duo_pro_trial_expired_widget feature flag and make the feature permanent

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Related to #478735

Edited by Serhii Yarynovskyi

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