[FIX] web: ListView: groupby selection field at level 2

Before this rev., there was a traceback when grouping a list view
by a, e.g., many2one field, and then by a selection field. It
crashed when formatting the title of the group, because the type
of the grouped field was incorrectly determined (it selected the
type of the inner grouping level, not the current one). For
instance, it tried to format a many2one like if it was a selection.

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