chore(tile-group): remove unrecognized prop from tests

[jendowns]

The following error is generated in tests for TileGroup --

  ● Console

    console.error node_modules/react-dom/cjs/react-dom.development.js:545
      Warning: React does not recognize the `labelText` prop on a DOM element. If you intentionally want it to appear in the DOM as a custom attri
bute, spell it as lowercase `labeltext` instead. If you accidentally passed it from a parent component, remove it from the DOM element.
          in input (created by RadioTile)
          in RadioTile (created by TileGroup)
          in div (created by TileGroup)
          in fieldset (created by TileGroup)
          in TileGroup (created by WrapperComponent)
          in WrapperComponent

It doesn't look like labelText is a valid prop for the component anymore.

Changelog

Removed

• remove unrecognized labelText prop from TileGroup tests

[asudoh]

LGTM 👍 - Thanks @jendowns!

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