Remove flipper AD bar
Remove flipper AD bar

Summary: This diff removes the FlipperAD bar which is shown in the layout inspector. Fixes [this](https://fb.workplace.com/groups/flippersupport/permalink/881019929045333/)

Reviewed By: passy

Differential Revision: D21716761

fbshipit-source-id: 503fc0002d137032c9a40853f7eeea599d65acea

facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper