FIX: Regression with finding reviewable counts on topics

This was a fairly serious regression on sites with large (mega) topics,
however it was limited to staff.

The issue here is the query was using filtered_post_ids which I'd
assumed was already windowed to the current page, when in fact it was
all the ids in the topic. This fix corrects it by using the correct
windowed collection.

lib/topic_view.rb

@@ -424,7 +424,7 @@ class TopicView
       # Create a hash with counts by post so we can quickly look up whether there is reviewable content.
       @reviewable_counts = {}
       Reviewable.
-        where(target_type: 'Post', target_id: filtered_post_ids).
+        where(target_type: 'Post', target_id: @posts.map(&:id)).
         includes(:reviewable_scores).each do |r|
 
         for_post = (@reviewable_counts[r.target_id] ||= { total: 0, pending: 0, reviewable_id: r.id })