Revert D19389776: fix(flipper-static): show default warning message on firing in unknown flags

Differential Revision:
D19389776

Original commit changeset: 2f844e38c8be

fbshipit-source-id: cbd3fa7032082fc7e445bd2dfdbdfcc4ed0d2562

static/index.js

@@ -70,7 +70,6 @@ const argv = yargs
   })
   .version(global.__VERSION__)
   .help()
-  .strict()
   .parse(process.argv.slice(1));
 
 const {config, configPath, flipperDir} = setup(argv);