[FIX] web: fetch dependency fields in x2many

Image field widget need the __last_update field alongside them
for caching purposes, though that field should never be present explicitly
in the views

Before this commit, the dependencies of field widgets were not merged into
the model's fields definition, creating a traceback when adding an image field widget
into a x2many list

After this commit, there is no traceback and the image field works properly

closes #27545

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