Does not recalculate amount if changed on sale_order_line

[anajuaristi]

Module

sale_commission

Describe the bug

Commision amount is not recalculated if you change manually the sale_commision to apply in a sale order line for one agent.

To Reproduce

Affected versions:
Tested in V14

Steps to reproduce the behavior:
1.Go to sale_order_line, click on agents
2.Change sale_commision for one agent line --> The amount is not recalculated and the field can not be updated manually, so it's not possible to fix the incorrect amount directly on the line

3. Add a new agent to the line. Assing a commision. Save --> The amount is correctly calculated for the new agent.

Expected behavior
Selecting a commision in an agent line should recalculate the line amount.

Additional context
The issue can be avoided, just following the steps:

1. Delete the agent line and save
2. Add a new line with agents and commision as needed
3. save --> The commision for all agents will be correctly calculated on the line.