eliminate month scale for popular searches (takes up too much space in redis)

app/presenters/intro_presenter.rb

@@ -1,6 +1,6 @@
 class IntroPresenter
   def each
-    PopularSearchService.new(Date.today, "month").each_search(20) do |query, count|
+    PopularSearchService.new(Date.today).each_search(20) do |query, count|
       yield(query, PostSets::Intro.new(query))
     end
   end

app/presenters/post_set_presenters/post.rb

@@ -33,7 +33,7 @@ module PostSetPresenters
 
     def popular_tags
       if PopularSearchService.enabled?
-        PopularSearchService.new(Date.today, "day").tags.slice(0, 25)
+        PopularSearchService.new(Date.today).tags.slice(0, 25)
       else
         Tag.trending
       end