The HandleField widget should not be displayed in grouped list
view, probably because we do not support the resequence feature
in this situation. This is the legacy spec.
In the wowl ListView, we didn't implement this restriction. As
a consequence, some list views (e.g. DebugMenu > Open View) didn't
render correctly when grouped, because the presence of the handle
field (which is aggregatable) didn't leave any space to display
the group titles.
closesodoo/odoo#100356
Signed-off-by: Géry Debongnie <ged@odoo.com>