Show request ID in kiosk queue

Each active request in the kiosk Live Queue now displays its
request number before the customer name (e.g. #42 jess) so
multiple requests from the same email can be distinguished.

Bumps version to 0.5.4.

app.py

@@ -1039,6 +1039,7 @@ def kiosk():
             email = r.get('email') or ''
             name = email.split('@')[0] if '@' in email else email
             queue.append({
+                'id': r['id'],
                 'name': name or 'Guest',
                 'status': KIOSK_STATUS_MAP[r['status']],
                 'raw_status': r['status'],