Fix perms for viewing a channel

I think this is just a typo, but might not be, so pull requesting.

"Can view my "public" channel profile" applies literally to the profile at the moment - it would seem a bit of an overkill to have a permission for a single page, so I believe the intended behaviour was to include the channel page in that - distinct from "Can view my "public" stream and posts" as in, "can see the my posts in your matrix".