Incorrect journal for multi-company setup

[blueuc]

Module

subscription_oca/models/sale_subscription_line.py

Describe the bug

When dealing with a multi-company setup with no product-level income accounts assigned, the invoice line creation pivots to the "product category" assigned accounts. However, it does not correctly reference the company field in the subscription template when referencing the category data. This can result in incorrect income accounts being used upon invoice creation.

To Reproduce

Affected versions:

Steps to reproduce the behavior:

1. Create multi-company instance
2. Set up product category with different income accounts for each company
3. Convert subscription to invoice for company B, it will use company A's product category income account.

Expected behavior
The company should be taken into account when referencing the 'product category' account settings.

[blueuc]

Proposed solution: utilize company context:
3d54ed7

[pedrobaeza]

I think it should be with_company. Can you propose a PR?