[FIX] web: prevent 'load' event from being handled twice

In grouped list view, when a pager is clicked inside a group, a
'load' event is triggered to reload the data with the new offset.
The event is handled by the list's controller.

However, when the list is in the modal, the event must be stop
propagated by the controller of the modal, so that it doesn't go
up to the controller of the view displayed behind the modal. It
happens for example by reproducing the following steps:
  - go to Lunch
  - add a line
  - search more products
  - group by vendor in the modal
  - unfold a group
  - click on the pager (the group must contain more than 80 records)

Before this rev., it crashed because the controller of the form
view tried to handle the event.

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