[FIX] survey: fix datetime picker
[FIX] survey: fix datetime picker

Fixing 59a50e7628e3, were minDate & maxDate are declared before usage.

closes odoo/odoo#44368

Signed-off-by: Nicolas Martinelli (nim) <771435c469f83f6aa9c405ac5e1ed06314a94f2d@odoo.com>

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo