### Commit 1 

In the point of sale environnement we want to be able to edit html field
in a minimal way. So only core plugins are added to the html_editor.

As we have a special assets environnement for the point_of_sale we can
directly patch the main `htmlField` definition without impacting main
assets of Odoo.

So in Order to make it work we need to remove the preventDefault on
backspace key at the initialization of PoS.

Enterprise: 79703

### Commit 2

The html editor should only work with the “CORE_PLUGINS” plugin set.
But when an HTML field is used only with this Set a traceback is raised
because the “MediaPlugin” plugin is missing.

This is due to this piece of code:
```js
async getEditorContent() {
    await this.editor.shared.media.savePendingImages();
    return this.editor.getElContent();
}
```

Each time an HTML input is unfocused, this method is called and attempts
to save the pending images. The problem is that media.savePendingImages
depends on the “MediaPlugin”.

A quick fix is made in this commit by adding a question mark after media
to avoid traceback if the plugin is missing.