Remove piref info from MembersPage urls

URLs stripped of 'piref' info point to pages that list the members
in duplicate. Calling .uniq ensures we get each URL only once.

Author: Oliver Denman

lib/members_page.rb

@@ -1,11 +1,13 @@
 # frozen_string_literal: true
 require 'scraped'
+require_relative 'remove_session_from_url_decorator'
 
 class MembersPage < Scraped::HTML
   decorator Scraped::Response::Decorator::CleanUrls
+  decorator RemoveSessionFromUrlDecorator
 
   field :member_urls do
-    noko.css('div#RESULTADOS_DIPUTADOS div.listado_1 ul li a/@href').map(&:text)
+    noko.css('div#RESULTADOS_DIPUTADOS div.listado_1 ul li a/@href').map(&:text).uniq
   end
 
   field :next_page_url do