Add missing page vars

layouts/_default/list.atom.xml

@@ -4,7 +4,7 @@
 {{ $date := "2006-01-02T15:04:05Z07:00" }}
 {{ $description := cond $page.IsHome ($page.Param "paige.site.description") $page.Description | markdownify }}
 {{ $icon := $page.Param "paige.feeds.atom.icon" | absLangURL }}
-{{ $id := printf "tag:%s,%s:%s" (urls.Parse site.BaseURL).Host (.PublishDate.Format "2006-01-02") .RelPermalink }}
+{{ $id := printf "tag:%s,%s:%s" (urls.Parse site.BaseURL).Host ($page.PublishDate.Format "2006-01-02") $page.RelPermalink }}
 {{ $language := site.LanguageCode }}
 {{ $limit := site.Config.Services.RSS.Limit }}
 {{ $logo := $page.Param "paige.feeds.atom.logo" | absLangURL }}