If the method `_auto_install_l10n` is called programmatically on a DB
where the localization has already been installed, useless processing is
performed by `button_install`.

Do not call this method if no module need to be installed.

closes odoo/odoo#106407

X-original-commit: 11e9d3f1
Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>