Fix the "must check that invisible fields are made visible" scripting integration test #17940
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We should not wait for an arbitrary amount of time, which can easily cause intermittent failures, but wait for a property value change instead. Note that this patch mirrors the approach we already use in other scripting integration tests that also check for a visibility change; see e.g. the "must show a text field and then make in invisible when content is removed" test.
Fixes #17939.
Fixes a part of #17656.