[ListBox] KeyDownEnter click first button it finds.

[jeffgrannes]

🐛 Bug report

When focused on an ListBox in a form, when the enter key is pressed the ListBox was incorrectly clicking a button outside the form with type='button'

Current Behavior

Pressing enter on ListBox will click first button found in the DOM.

Expected behavior

The ListBox would click a button with no type or an element with type='submit'.

Suggested solution(s)

We can be more specific to which buttons get clicked - a proposed fix is in this PR:
#903

Your environment

Software	Name(s)	Version
Reach Package		0.16.5
React		17.0.2
Browser		Chrome
Assistive tech
Node		14.17.5
npm/yarn	yarn	1.22.11
Operating System	MacOS	MacOS

[ccveer]

Would be great if we could get some traction on this issue since its affecting our a11y compliance.

[chaance]

Fixed in #903