Set `type` of `<button>`s in vanilla array renderer

[joefreeman]

This updates the <button>s in the vanilla array renderer to set the type to "button". This allows a <JsonForms> to be contained within a <form> without these buttons triggering a submit of the form.

I believe this is fixing the same issue as #1731, but for the vanilla renderers.

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[sdirix]

Thanks for the contribution :heart:. The change looks good! Can you fix the linter errors?

[coveralls]

coverage: 84.881%. remained the same when pulling b215b7412b13795bf32c8c283df127b0a7dbef78 on joefreeman:vanilla-button-types into 30c1b79fbb9373bc2afacebc22943b6129eb1be6 on eclipsesource:master.