[ListboxInput]: Update submit button querySelector specificity

[jeffgrannes]

Hello, our website has a Listbox within a form. When we press enter on the Listbox, it is currently clicking the first button that it finds on the page and not our submit button. This PR updates the specificity of the selector to select the first button without a type or the first item with type=submit.

Thank you!

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• Test the change in your own code (Compile and run).
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This pull request:

• Creates a new package
• Fixes a bug in an existing package
  [ListBox] KeyDownEnter click first button it finds.  #904
• Adds additional features/functionality to an existing package
• Updates documentation or example code
• Other

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[ccveer]

@chaance, could you take a look at this? We need this change in order to pass our a11y compliance audit.