[FIX] website: website-specific child views

On a eCommerce page were there was no SEO optimization change:
- Customize > Activate "eCommerce categories"
- Customize > Activate "Colapsible category list"
- Promote > Optimize SEO > Change description > Save

Nothing happens.

Actually, an SQL error is raised because of the `ondelete='restrict'`
set at:

https://github.com/odoo/odoo/blob/897feb553e6ef75af9434cb77436b26abde3a761/odoo/addons/base/models/ir_ui_view.py#L212

In this case, we have the following structure:

```
View 1
|
---> View 2 (Website-specific)
|
---> View 3 (Website-specific)
```

For example:

```
Products
|
---> eCommerce Categories (Website-specific)
|
---> Collapsible Category List (Website-specific)
```

Since the inherited view (View 2) is website-specific, we duplicate it
and try to unlink it. However, this view has children, which raises the
error.

To solve the issue, we re-attach the children of the inherited view to
its copy. In a realistic situation, the children of a website-specific
view should also be website-specific, so there is no need to apply the
'copy or re-attach' logic recursively.

We end up with:

```
View 1 (Website-specific, duplicated)
|
---> View 2 (Website-specific, duplicated)
|
---> View 3 (Website-specific)
```

opw-1997946

closes odoo/odoo#33787

Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

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