GitHub review comments shouldn't apply "needs work"

[wendtek]

When using GitHub's review system, a user has 4 options:

1. Comment
2. Approve (optionally with comment)
3. Request changes (optionally with comment)
4. Comment on specific lines

If a user comments (1) or comments on specific lines (4), it will apply the "needs work" label until that user uses the approve (2) action.

At the very least, I think the comment should not apply "needs work", but it may also be good to accept the ":+1:" and "lgtm" messages from those comments.