Fixed formattting of tooltip_utils

Summary: Now that my linter is working fix style bugs.

Test Plan:
- Open webpage scratchpad
- Open imageModal
- See that scrollspy and lazy loading still works

Reviewers: john, pamela

Reviewed By: john, pamela

Subscribers: john, #cs

Maniphest Tasks: T3350

Differential Revision: http://phabricator.khanacademy.org/D14654