Remove the read_channel permission to unfollow a thread (#20662)

api4/user.go

@@ -3172,11 +3172,6 @@ func unfollowThreadByUser(c *Context, w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if !c.App.SessionHasPermissionToChannelByPost(*c.AppContext.Session(), c.Params.ThreadId, model.PermissionReadChannel) {
-		c.SetPermissionError(model.PermissionReadChannel)
-		return
-	}
-
 	err := c.App.UpdateThreadFollowForUser(c.Params.UserId, c.Params.TeamId, c.Params.ThreadId, false)
 	if err != nil {
 		c.Err = err