Summary: Just a small fix to normalise import path to make typescript happy when this code is located in "flipper" folder (e.g. after installing "flipper" package as dependency) rather than "app" folder.
Reviewed By: jknoxville
Differential Revision: D27156167
fbshipit-source-id: 24495d6b1a756b20fadf62eec18bfe6665eb78e2