Fix calendar copy URL

Author: stefanv

layouts/calendars/list.html

@@ -27,7 +27,7 @@ <h5 class="subtitle is-5 is-muted">{{ .Params.Subtitle }}</h5>
             <img
               class="calendar-copy"
               src="/images/content_copy.svg"
-              onclick="navigator.clipboard.writeText('{{ path.Join $pageLink (printf "%s.ics" $key) }}');"
+              onclick="navigator.clipboard.writeText('{{ printf "%s%s.ics" $pageLink $key }}');"
             />
             {{ range .events }}
             <div class="calendar-event">{{ .summary }}</div>