Killed Flipper headless

Reviewed By: nikoant

Differential Revision: D24160480

fbshipit-source-id: 221e60473dddc0a49cea674e210beb6f85b1b03c

desktop/app/src/fb-interfaces/Logger.tsx

@@ -10,6 +10,5 @@
 export {LogTypes, TrackType, Logger} from 'flipper-plugin';
 
 export type Args = {
-  isHeadless?: boolean;
   isTest?: boolean;
 };