role="listbox" both on suggestionsContainer as well as suggestion ul

[gaurav5430]

Codepen: https://codepen.io/gaurav5430/pen/rNaYgBe?editors=0010

1. Focus on the input field
2. Type c, and wait for suggestions to appear
3. Look at the rendered html

Observed behaviour: both the suggestions container and the suggestions ul have role="listbox"

Expected behaviour: only the ul should have role="listbox".

[gaurav5430]

I think this is a regression, it seems to not set the role="listbox" on the container in 9.0.0 , but it does so in the latest version which is 9.4.3

[sundquistm]

This issue seems to persist from v9 into v10.

[thibaudcolas]

This seems like a pretty straightforward fix for an issue affecting all users of the library, so I gave it a shot in #830.