[FIX] web: generate proper x2many commands in some cases

When creating a new record with a non empty default value for a one2many
field, we did send the command 0 (for each one2many line) instead of the
command 1 (update).  This was a pretty big problem, because then the
server would try to create a line with possibly incomplete data.

For example, it was not possible to create expense sheets: go to expense
menu, select one expense in the list view, click on the action menu
'submit to manager', this opens a form view with a one2many with the
selected expense, then save.  Before this commit, this would lead to a
server error.

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