mozilla / blurts-server / #13118

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Pretend HTMLElement.shadowRoot is always set

We generally only tend to access it after having called
this.attachShadow({ mode: 'open' }), and the error message about it
potentially being undefined at every location we access
this.shadowRoot is more noisy than helpful.

See also
https://github.com/mozilla/blurts-server/pull/2959#discussion_r1154023113
and
https://github.com/mozilla/blurts-server/pull/2959#discussion_r1154960095

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