Update account_journal_dashboard.py

[bfotop]

Description of the issue/feature this PR addresses:
In accounting dashboard the awaiting payments and payments to do points to total amounts not the residual_signed

Current behavior before PR:
residual_signed Is displayed as sudjested above

Desired behavior after PR is merged:

I confirm I have signed the CLA and read the PR guidelines at www.odoo.com/submit-pr

In accounting dashboard the awaiting payments and payments to do must point to residual_signed not amount_total

[C3POdoo]

Dear @bfotop,

Thank you for your contribution but the version 9.0 is no longer supported.
We only support the last 3 stable versions so no longer accepts patches into this branch.

We apology if we could not look at your request in time.
If the contribution still makes sense for the upper version, please let us know and do not hesitate to recreate one for the recent versions. We will try to check it as soon as possible.

This is an automated message.