[autoform] Use fieldclass from kwargs in guess_field for non-final relations This follows up on af969080e7e6 in which a "fieldclass" kwarg has been added in EntityFieldsForm.field_by_name() before calling guess_field(). In this changeset, this value was only used for final relation but the way non-final relation actually also changed since we also use guess_field from these relation (previously, the field class specified through uicfg was instantiated directly in EntityFieldsForm.field_by_name()). So in the non-final case in guess_field() we simply try to retrieve "fieldclass" from kwargs and fall back to RelationField.

^build$
^dist$
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^.tox$
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\~$
\#.*?\#$
\.swp$
^doc/book/en/apidoc$
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cubicweb/server/test/data/slapd.conf
debian/python-cubicweb
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debian/cubicweb-doc
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syntax: regexp
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^doc/html/
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