[FIX] sale_timesheet: group by invoice for timesheet billed on time

Before this commit, all rows about timesheets in the revenues of project
profitability section can be clickable and shown the timesheets related
grouped by invoice. However, the invoice is only linked to the
timesheets containing a SOL with the invoice type of the product is set
to 'delivered' and the service_type of this product is set to
'timesheet'. It means only one timesheet row in the revenues has some
timesheets with an invoice linked.

This commit only group by invoice the views in the action called when
the user clicks on 'Timesheet (Billed on Time)' row name.

task-2814466

Part-of: odoo/odoo#88219

addons/sale_timesheet/models/project.py

@@ -474,8 +474,7 @@ class Project(models.Model):
                 if record_ids:
                     if invoice_type not in ['other_costs', 'other_revenues'] and can_see_timesheets:  # action to see the timesheets
                         action = get_timesheets_action(invoice_type, record_ids)
-                        if not cost:
-                            action['context'] = json.dumps({'search_default_groupby_invoice': 1})
+                        action['context'] = json.dumps({'search_default_groupby_invoice': 1 if not cost and invoice_type == 'billable_time' else 0})
                         data['action'] = action
                 profitability_data.append(data)
             return profitability_data
@@ -494,7 +493,7 @@ class Project(models.Model):
             record_ids = aal_revenue.get('record_ids', [])
             if can_see_timesheets and record_ids:
                 action = get_timesheets_action(revenue_id, record_ids)
-                action['context'] = json.dumps({'search_default_groupby_invoice': 1})
+                action['context'] = json.dumps({'search_default_groupby_invoice': 1 if revenue_id == 'billable_time' else 0})
                 revenue['action'] = action
 
         for cost in profitability_items['costs']['data']: