[FIX] website_form_editor: search_read result
[FIX] website_form_editor: search_read result

The new RPC API calls the '/web/dataset/search_read' route for a
search_read instead of '/web/dataset/call_kw/model/method'. The
first one returns an object with keys count and records, whereas
the other one only returns the records.

When converting the code in website_form_editor to this new API,
one forgot to update the handling of the RPC result.

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