[FIX] web: save fields in m2m (list_editable) with attributes and check all lines

Issue: steps to reproduce:

create a purchase order
choose a supplier
choose a product
change the quantity
don't click anywhere on the form, just click on "confirm order"
you get an error "invalid field: scheduled date"

Use dataset instead of record because record can have an other value (a short for a moment due to deferred).
Use silent option to avoid onchange.

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