[FIX] sale_management: consider timezones for quotation validity days
[FIX] sale_management: consider timezones for quotation validity days

The validity_date and/or remaining_validity_days fields on the sale
order
could be wrong due to different timezones.

Furthermore, using datetime.now to create a date is unnecessary.

closes odoo/odoo#49639

X-original-commit: 40e0c39fb410d018d007f2c70c12daf4289d2370
Signed-off-by: Yannick Tivisse (yti) <200a91eb0e5cc4726d6a3430713b580138f34298@odoo.com>
Signed-off-by: Victor Feyens (vfe) <433cda6c0f0b5b2dac2ef769109a6da90db60157@odoo.com>

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