Control De-AMP feature to bypass Google-hosted AMP pages.

De-AMP allows Brave users to bypass Google-hosted AMP pages and instead visit the content's publisher directly. This protects users' privacy, security and internet experience by preventing tracking and profiling users through AMP. If this policy is set to true, De-AMP will be enabled to redirect users away from AMP pages to the original publisher's content. If this policy is set to false, De-AMP will be disabled and users may visit AMP pages as served by Google. If this policy is left unset, De-AMP will be controlled by the user setting (enabled by default).