This commit fixes the display of the rainbowman message when leads go through
the "won" stage.
Currently, some flows don't show the message when they are supposed to or show
the message when they are NOT supposed to.
This is because the case when the form is saved through the regular "Save"
button is not handled at all.
The CRM form controller extension was completed with the missing use case and
fixed.
An additional QUnit test ensures the correct behavior.
Task-2418294
closesodoo/odoo#63599
X-original-commit: c5cbb9975897935e9ed4e1bce80335207758fa24
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>