[FIX] website_slides_forum: put demo in demo

Otherwise zizisse error traceback prone.

closes odoo/odoo#31672

Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

addons/website_slides_forum/__manifest__.py

@@ -14,9 +14,11 @@
     'data': [
         'views/slide_channel_views.xml',
         'views/website_slides_templates.xml',
-        'data/slide_channel_demo.xml',
         'views/assets.xml',
         'views/website_slides_forum_templates.xml'
     ],
+    'demo': [
+        'data/slide_channel_demo.xml',
+    ],
     'auto_install': True,
 }