Nyall Dawson 615b63e76d [processing] When configurating a field calculator algorithm in a model,
ensure that the correct expression context is set for the widget

Otherwise we don't see any of the available variables ready for
use in the calculation.

We need to do this manually after creating the widget, because the
context generator isn't set till after the widget is created, and
this particular widget configuration doesn't fetch the expression
context on demand.
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