Update account_analytic_default.py

Fix issue #270 : account_analytic_default doesn't work with company_id condition
[FIX] small fixes

- set the company_id parameters at the end of the method to avoid incompatibities with calls in account_analytic_plans
- instead of checking the context, actually pass the company_id argument in the product_change from uos_id_change
Merge pull request #453 from odoo-dev/master-and-company-mat

[FIX] account_analytic_default: make company_id field actually work (fixes #270)