[FIX] Correct floating number comparison for min_quantity orderpoint in scheduler

Fix basic floating point math issue in procurement scheduler when comparing
current quantity with orderpoint minimum quantity. In certain cases floating
point comparison could result in e.g 400.0 < 400.0 == True due to typical
floating point comparison issues, as Odoo doesn't use Decimal types where the
issue doesn't exist.
Use float_compare helper to solve this with floating point type.
and even better would be to actually use the Decimal module whenever numeric/decimal is used in the database, so all these problems would simply not exist. But I have no idea if any changes towards that would be outright rejected or not.