[FIX] web: boolean_toggle widget ignores readonly attribute

The boolean_toggle should only be disabled when there is a readonly
modifier, not when the view is in readonly mode.

Cause of the issue

  The input was disabled but the `_onClick` was registered on the
  widget root node.

Solution

  - Listen for clicks on the input element
  - Override the render method to set the disabled prop according to the
    readonly modifier.

opw-2739468

closes odoo/odoo#91465

X-original-commit: 8021562b
Signed-off-by: Michaël Mattiello <mcm@odoo.com>
Signed-off-by: Hubert Van De Walle <huvw@odoo.com>