Fix `event-group` shortcode for changes in `resolve-refs` partial (#1754)

Signed-off-by: Kévin Commaille <zecakeh@tedomum.fr>

changelogs/internal/newsfragments/1754.clarification

@@ -0,0 +1 @@
+Add support for `$ref` URIs containing fragments in OpenAPI definitions and JSON schemas.

layouts/shortcodes/event-group.html

@@ -12,7 +12,7 @@
 
 */}}
 
-{{ $path := "event-schemas/schema" }}
+{{ $base_path := "event-schemas/schema" }}
 
 {{ $events := index .Site.Data "event-schemas" "schema" }}
 {{ $group_name := .Params.group_name }}
@@ -22,6 +22,7 @@
     {{ $prefix := substr $event_name 0 (len $group_name) }}
     {{ if eq $prefix $group_name }}
 
+        {{ $path := delimit (slice $base_path $event_name) "/" }}
         {{ $event_data = partial "json-schema/resolve-refs" (dict "schema" $event_data "path" $path) }}
         {{ $event_data := partial "json-schema/resolve-allof" $event_data }}