Fix sandbox plugin initialisation
Fix sandbox plugin initialisation

Summary: Fixes https://github.com/facebook/flipper/issues/1515

Reviewed By: passy

Differential Revision: D23572769

fbshipit-source-id: a541e2b4f626f520f39d21c3bf05d43ed919feb8

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