use same name (raw_stats) for consistency

update to use the same name for the method and the memoizing instance
variable.

Author: mikej

app/presenters/how_you_found_us_presenter.rb

@@ -39,7 +39,7 @@ def data_present?
   private
 
   def raw_stats
-    @stats ||= @chapter.members.where.not(how_you_found_us: nil).group(:how_you_found_us).count
+    @raw_stats ||= @chapter.members.where.not(how_you_found_us: nil).group(:how_you_found_us).count
   end
 
   def how_values