Slightly simplify logic for determining if an inline comment has an effect

Summary: Minor cleanup, this logic can be simpler. Instead of special-casing inlines as having an effect if the have a comment, just consider any transaction with a comment to have an effect. I'm fairly certain this is always true.

Test Plan: Made inlines, tried to submit empty comments. Behavior unchanged.

Reviewers: chad

Reviewed By: chad

Differential Revision: https://secure.phabricator.com/D18468