[FIX] web: Domain arrayToString support 'in' operator

The function `arrayToString` did not properly support domains containing
arrays of booleans, for instance `[["val", "in", [true, false]]]`. The
array containing the boolean was directly JSON stringified without being
converted to its python equivalent.

closes odoo/odoo#83817

Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>
Co-authored-by: Lucas Lefèvre <lul@odoo.com>