fix "view on site" for non-integer pks

Author: timgraham

django/contrib/admin/sites.py

@@ -279,7 +279,7 @@ def wrapper(*args, **kwargs):
             path("autocomplete/", wrap(self.autocomplete_view), name="autocomplete"),
             path("jsi18n/", wrap(self.i18n_javascript, cacheable=True), name="jsi18n"),
             path(
-                "r/<int:content_type_id>/<path:object_id>/",
+                "r/<str:content_type_id>/<path:object_id>/",
                 wrap(contenttype_views.shortcut),
                 name="view_on_site",
             ),