[FIX] web: add nbsp on Tax-ID line in report

Install purchase, configure in company settings a Tax (i.e. BE 231312).
In "General Settings > Business Documents > Fomat" select A4.
Open a purchase, print the report.

The "TAX ID" string in the footer will be split into two lines, while it
should be consistent with the rest of the footer (inline items).

Adding a nbsp (xml version) entity fix the issue

opw-2089238

closes odoo/odoo#39704

Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>