[FIX] sale: missing triggers on invoice_ids
[FIX] sale: missing triggers on invoice_ids

As 'invoice_ids' on sale.order is a computed field, creating
a refund should invalidate this field as 'invoice_ids'
should contain invoices, refunds, ...
When using the refund wizard, the credit note will be linked
to the SO lines (see `_refund_cleanup_lines` override in sale).
Without the new trigger, invoice_ids will not be recomputed, and
executing 'sale_order.invoice_ids[1]' will not return the refund
account.invoice.
This commit fixes it.

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