Since the redux slice is set up based on content or channel ID (for Channel Discussion page), re-use the channel ID for the case of "own comments". We always clear each ID when fetching page-0, so no worries of conflict when actually browsing the Channel Discussion page.
This reduces one lookup as clients will always have the claimID ready, but might not have the full URI.
It was using URI previously just to match the other APIs.
- Switch from 'author' to 'creator' to disambiguate between comment author and content author. For comment author, we'll use 'commenter' from now on.
- Corrected 'commenterClaimId' to 'creatorClaimId' (just a typo, no functional change).