[I18N] sale: Remove duplicated term from pot

Commit 6af6da5c introduced a duplicated term to the file .pot, which
causes the following error when trying to re-load translations:

```
ON CONFLICT DO UPDATE command cannot affect row a second time
HINT:  Ensure that no rows proposed for insertion within the same
command have duplicate constrained values.
```

This commit removes on eof the duplicates, leaving only the valid one.
```
```

closes odoo/odoo#31683

Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>

addons/sale/i18n/sale.pot

@@ -1161,11 +1161,6 @@ msgstr ""
 msgid "Details"
 msgstr ""
 
-#. module: sale
-#: model:ir.model.fields,field_description:sale.field_res_config_settings__module_website_sale_digital
-msgid "Digital Content"
-msgstr ""
-
 #. module: sale
 #: model:ir.model.fields,field_description:sale.field_sale_report__discount
 msgid "Discount %"