If two snippet options are declared using the same data-js="..." and
that they end up targeting the same snippet in some cases, only one of
those two snippet options was shown.

This case occurred in a theme (avantgarde) for the map snippet.

closes odoo/odoo#38498

X-original-commit: https://github.com/odoo/odoo/commit/5ee0147c1ab9903d97d5409c972910eecd688fc7


Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>