For some reason the `website_id` field was added in the form view of the
`ir.asset` model in a website module overide but it was not done for the
list view where it matters equally (if not most regarding the flow).

Indeed, those views / this model is mainly accessed for debugging
purpose in which case you are most likely looking for a specific asset.
In the website case, it's most of the time to find the custom asset
that was created following a scss customization in the right panel of
the website builder.
In such a case, it will have a website_id and will be easy to find in
the list view.

It's also the case for all the records having a `website_id`, we show
that field in both form and list view, it's always important when
managing / debugging DBs in multi-website environment.

See [1] for introduction of `ir.asset`.

[1]: https://github.com/odoo/odoo/commit/8cc066173dfb61bd95b8e1f0716f71f4e251810a



closes odoo/odoo#111883

Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>