Editing a draft comment fails, delete is possible

[jayv]

Potentially 2 bugs:

• edit comment function on a draft MR review is guarded by the author which is compared against the username, but author seems to be rewritten to You (draft) so it keeps failing with "can only edit your own comments", if I overwrite that back to my username editing works.
• delete comment function always works, is lack of guards intentional?

[afewyards]

Will take a look after holiday, look like valid points