[FIX] sale_timesheet: remove group_by

- Group the SO list view by Analytic Account
- Go to a SO
- Click on the stat button 'Timesheets'

Traceback because the field `analytic_account_id` is not on Timesheets.

opw-2124539

closes odoo/odoo#40840

X-original-commit: 3f17dd36
Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>