[FIX] Account journal dashboard bar graph

Fix _get_bar_graph_select_query to correctly compute the residual
amount when calculating the values for the graph of a bill or invoice
journal.

closes odoo/odoo#41592

X-original-commit: 73d28be404901378dc06e756868e5a1ef6cf7b0b
Signed-off-by: Laurent Smet <smetl@users.noreply.github.com>

addons/account/models/account_journal_dashboard.py

@@ -200,18 +200,17 @@ class account_journal(models.Model):
         the bar graph's data as its first element, and the arguments dictionary
         for it as its second.
         """
+        sign = '' if self.type == 'sale' else '-'
         return ('''
             SELECT
-                SUM((CASE WHEN move.type IN %(purchase_types)s THEN -1 else 1 END) * line.amount_residual) AS total,
+                ''' + sign + ''' + SUM(move.amount_residual_signed) AS total,
                 MIN(invoice_date_due) AS aggr_date
-            FROM account_move_line line
-            JOIN account_move move ON move.id = line.move_id
+            FROM account_move move
             WHERE move.journal_id = %(journal_id)s
             AND move.state = 'posted'
             AND move.invoice_payment_state = 'not_paid'
             AND move.type IN %(invoice_types)s
         ''', {
-            'purchase_types': tuple(self.env['account.move'].get_purchase_types(True)),
             'invoice_types': tuple(self.env['account.move'].get_invoice_types(True)),
             'journal_id': self.id
         })