Regression: assistive hints are broken in 2.04

[edwardhorsford]

Assistive hints - the instructions for how to use the autocomplete - are broken in 2.04, but not in 2.03.

I can't see anything obvious that changed between the releases, but the PR for 2.0.3 mentions hints.

Steps to reproduce

Use enhanceSelectElement on a select. Observe that the rendered autocomplete does not have instructions for how to use it. Swap to 2.0.3 and observe that there are instructions.

You should also be able to test that providing tAssistiveHint to the autocomplete does nothing with 2.0.4, whilst it works in 2.0.3.

Likely related:
#498
#589