[FIX] website_sale: missing quote in .pot file

This commit fixes my mistake in this previous commit: ff7a82f0cb31699e6169654b4bd62a895b2f09b3

closes odoo/odoo#80619

Signed-off-by: Arnold Moyaux <arm@odoo.com>

addons/website_sale/i18n/website_sale.pot

@@ -988,7 +988,7 @@ msgstr ""
 
 #. module: website_sale
 #: model_terms:ir.ui.view,arch_db:website_sale.res_config_settings_view_form
-msgid DHL Express Connector
+msgid "DHL Express Connector"
 msgstr ""
 
 #. module: website_sale