The note content was not sanitized against HTML content.
This is not considered as a security issue as an activity can only be
created by trusted employees, however there is no reason not to
sanitize it.
Courtesy of Lauri Vakkala, silverskin
closesodoo/odoo#48889
X-original-commit: 970b460295c3d33dbb089ef6b7224b472e6b568d
Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>