[FIX] mail: restores the documentViewer modal
Revision on
https://github.com/odoo/odoo/commit/34bbdd88c0bc354b76b254bb78c4eb786f3d08c0#diff-9da02f8f30ea349fbc4b9884c2b77b78
The document viewer did not work properly because, by default, dialogs are non-active,
so most interactions were not possible (just pressing ESC to close the dialog worked).
The correct fix consists of using OwlDialog for DocumentViewer,
but that's basically close to a re-writing, so in the meantime marking it as always active is fine.
closes odoo/odoo#43446
Task: 2177011
Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>