[FIX] web: propagate view context in all x2m operations

It could happen in some cases that a rpc coming from a view was not made
with the context of the view (and from the action).  For example,

- enable "Lots & Serial Numbers" in the inventory settings
- create a stockable product tracked by lot
- go to the inventory dashboard, on the "receipts" card click on the
  three dots and then on "planned transfer"
this link forces the context key "planned_transfer" in the action
https://github.com/odoo/odoo/blob/11.0/addons/stock/views/stock_picking_views.xml#L725
- now add a stock move to move some quantity of the product you just
  created
- see that no button appears on the one2many list
- save
- see that a button appears on the one2many list

This is an issue because the read on the o2m at the end is made with the
wrong context.  The reason is that when we fetch x2m, we create a new
datapoint of type 'list' which did not reuse the context of its parent.

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