This commit fixes a bug introduced when migrating
from jquery deferred to native JS Promises (ab56e63).
Steps to reproduce:
1. Go to the Expense app
2. Create a new expense
3. Click on "Attach Document" and upload a file
=> crash and infinite loading spinner
After loading files, the `attach_document` widget is
supposed to call a callback action with attachment ids
as argument.
Currently, attachement ids are not correclty retrieved.
They are retrieved via the `arguments` object but since ab56e63
`arguments` refers to the arguments of the Promise callback
function and no longer to the handler function `_onFileLoaded`
arguments.
closesodoo/odoo#33048
Signed-off-by: VincentSchippefilt <VincentSchippefilt@users.noreply.github.com>