fix library download count bug

app/controllers/libraries_controller.rb

@@ -23,7 +23,7 @@ class LibrariesController < ApplicationController
     per_page = params[:per_page].to_i <= 0 ? 20 : params[:per_page].to_i
     @libraries = paginateHelper libraries.includes(:library_tags, :praise_tread_cache, user: :user_extensions), per_page
 
-    @download_count_map = Attachment.where(container_type: 'Library', container_id: @libraries.map(&:id)).group(:container_id).count
+    @download_count_map = Attachment.where(container_type: 'Library', container_id: @libraries.map(&:id)).group(:container_id).sum(:downloads)
   end
 
   def show