Suppressed category included in digest

[vinothkannans (Vinoth Kannan)]

@simon

topics = topics.where("topic_users.notification_level != ? OR topics.category_id NOT IN (?)", TopicUser.notification_levels[:muted], remove_category_ids)

I think the problem is the target user has already visited that topic and a “TopicUser” model record is created for that user. So that topic passes the above condition where we check whether it’s unmuted or not. In that case, the below PR should fix this issue.

FIX: exclude suppressed category topics in digest even if unmuted.