Prettier updates

[yondonfu]

What does this pull request do? Explain your changes. (required)

Contains the same prettier changes as https://github.com/livepeer/protocol/pull/512 except added those commits to confluence.

Specific updates (required)

See commit history.

How did you test each of these updates (required)

Ran tests.

Does this pull request close any open issues?

N/A

Checklist:

• [x] README and other documentation updated
• [x] All tests using yarn test pass

[yondonfu]

Cherry picked 6ac1cb5 from https://github.com/livepeer/protocol/pull/512 which just includes the removal of unneeded checks in test/integration/PoolUpdatesWithHints.js.