[IMP] digest: fix tip description

Before this Commit, while sending the digest emails, the tip description was
incorrect due to sanitizing. Some jinja was also badly converted into
inline qweb instead of regular qweb.

After this Commit, we have fixed the tip description field value. We do the
html_sanitize after rendering the QWEB template. So, we get the proper values
of conditions and aliases. Replacing jinja with qweb template, should use
<t t-out="variable"/> to print the dynamic value so, remove the inline_template
expression `{{` and `}}` and put the <t t-out="variable"/>.

Task-2704083

closes odoo/odoo#88937

X-original-commit: c08cdc39
Related: odoo/enterprise#26293
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>