Fix broken links on template statistics page

Tests assumed that the API returns the template `id` as part of the
object. It doesn’t – it returns it as the key used to look up the
object. The `id` was missing from the transformation into the format
used by the front end.

For some reason Flask is fine building the URL with `template_id=None`,
but obviously this doesn’t generate a valid link.

app/main/views/dashboard.py

@@ -321,6 +321,7 @@ def format_template_stats_to_list(stats_dict):
                 template['counts'].get(status, 0)
                 for status in REQUESTED_STATUSES
             ),
+            id=template_id,
             **template
         )