## Ticket
644 investigate following vs subscription preference data
## Issue
- iOS app uses colon for following/subscriptions.
- Front-end code handled the "colon vs. hash" for CHANNEL_SUBSCRIBE, but not for CHANNEL_UNSUBSCRIBE
## Repro
- Do a search like "Test" and filter to "Channels Only".
- Follow a bunch @test channels
- Unfollow any one of them. All of them gets unfollowed.
## Notes
The change in b9fc9b63 to compare the lower-case channel name probably made it even worse, since "@TeSt" would be removed too.
## Change
Not sure why channel name was used in the first place ... perhaps it was to cover canon vs perm uri?
Anyway, comparing uri makes more sense, so doing that instead.
