Before this commit, if hr_expense module was installed it was
impossible to configure alias_domain in the settings, the change
wasn't taken into account. This was due to the presence of the
field at two separate place and one of them having the readonly
parameter set.
This commit fix this issue that was introduced by :
5eca7b7378
Task-3127163
closesodoo/odoo#112443
X-original-commit: fc1c20cb5ce471b65120ec3eff7abd18ffd3a9fb
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>