[uicfg] Remove unpredictability from autoform_section initialization It was attempting to guess smart default values by looking at the opposite relation (neg_role), but depending on the (random) ordering of the schema, it may or may not have been set yet, leading to unpredictable result with varying hash seed. Remove those fuzzy lookup all at once, it may change some (unreliable) things in your app but at least it's still a bit easier to explain. Closes #16272968

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