Fix next_page heuristic

web/server.rb

       current_page = params[:page].to_i
       previous_page = current_page > 1 ? current_page - 1 : nil
 
-      if params[:current_count] == params[:full_count]
+      if (params[:current_count] + ((current_page - 1) * RESULTS_PER_PAGE)) == params[:full_count]
         next_page = nil
       else
         next_page = current_page + 1