[IMP] web: remove needless o2m onchange

Partial backport of master (-> v9) commit 059230512.

for the issue when removing an invoice line from an account.invoice,
three onchange where triggered:

- ListView account.invoice.line unlink the line id from its dataset,
  [[first onchange]]
  -> the line id is removed from the dataset which trigger an onchange

after this is done (and the onchange is finished), the following
onchange happen:

-- remove each record of the Collection of the ListView
   -> this remove the id of these record from the ListView List dataset
      [[second onchange]]
      -> this trigger an onchange albeit the dataset is not changed
         (since it was already removed before the first onchange)
   -> this trigger an onchange on the one2many_list of the ListView
      which has the same dataset as the ListView
      [[third onchange]]
      -> so an onchange is called yet again.

this commit removes the second onchange in this case where we remove ids
already removed from the dataset.

closes #8273
fixes #7595
opw-644706

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