bug fix for profile pictures on likes, reposts, etc

this is what originally caused #8 for me. not sure how having comment_type 'webmention' prevents the comment avatars from displaying, but this clears it, which makes them show up again.

sorry for the extra commits in the PR. i tried to fork your fork, but github made it a fork of acegiak's original repo. adding yours as a remote helped, but not entirely. feel free to just make this change in your repo manually and close this PR.