Hide generic channel display name and avatar on watch view

[kimsible]

First stab at : #2987
fixes #2953

• No avatar channel and generic display name (Main username channel) channel :
  the big avatar and account name redirect to the account page
  

• Generic display name (Main username channel) and a channel avatar is uploaded
  the small avatar is the channel avatar and redirect to the channel page
  

• Display name channel and avatar channel customized
  back to regular display
  

[Chocobozzz]

Nice job 👍 Just one little thing and we can merge this

[kimsible]

Nice job +1 Just one little thing and we can merge this

Thanks for the review =). I forgot the search result, should we also adapt display for this view ?

[Chocobozzz]

I forgot the search result, should we also adapt display for this view ?

I don't think so, because we are explicitly searching for channels. To not confuse users, let's keep the current display in the search page