QWeb fields formatting would go to its own `html_escape` function
which could skip escaping depending on an option. This handles the
`html-escape` option from the early days of qweb (added in 2013), it's
unclear that it's ever been used (certainly is not now) and has been
superseded by things like HTML fields anyway.
closesodoo/odoo#65720
Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>