[FIX] base: wkhtml2pdf multiple documents

Steps to reproduce:
- set up a header with company logo
- print 20 sale orders in arabic

Bug:
header disapears on most pages

Fix:
add a setting to allow users to increase the delay before printing

opw-3217155

closes odoo/odoo#121054

Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>

odoo/addons/base/models/ir_actions_report.py

@@ -332,7 +332,8 @@ class IrActionsReport(models.Model):
                 command_args.extend(['--header-line'])
 
         # Add extra time to allow the page to render
-        command_args.extend(['--javascript-delay', '1000'])
+        delay = self.env['ir.config_parameter'].sudo().get_param('report.print_delay', '1000')
+        command_args.extend(['--javascript-delay', delay])
 
         if landscape:
             command_args.extend(['--orientation', 'landscape'])