The domain "id = False" for the visibility of the "Split Expense"
was set because I (wrongfully) thought it was necessary to save
the record before the wizard could use it.
That is not the case, as the button call will first save the record
anyway - it was weird not to have this button immediately and made
the feature hard to discover.
I also changed the "create report" button for the same reason - there
is no need to restrict its usage to "saved" records (unlike the
"attach receipt" button which is a specific widget that needs the record
to exist in database to work).
closesodoo/odoo#97634
Signed-off-by: Kevin Baptiste <kba@odoo.com>