Fix employee detection in OSS version
Fix employee detection in OSS version

Summary: Changelog: Fix incorrect warning in OSS builds hinting to install a closed source build. Fixes #1853

Reviewed By: passy

Differential Revision: D26019227

fbshipit-source-id: 61a0270997d0aa67d55224e4f6268ed3103099c7

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