)

Fixes b/475312122

When the record button is clicked, the private `#recorder` field is set,
which is what changes the template from the "record" button to the
"stop" button. Since `#recorder` wasn't marked as `state()`, the
template wasn't re-rendered based on this assignment, and since clicking
the button immediately disables it, there was no way to stop recording.

Appears to have been a latent bug, exposed by
#7458 (found via
bisect). That PR resulted in `lit` being bumped from `3.3.1` to `3.3.2`,
which included a bugfix in the lit core library:
lit/lit#4999 "Fix a bug in change detection with
decorated standard private accessors".

The reason the fix in Lit broke Opal was because that in the same
microtask that `#recorder` was being set, the `#clearValues()` method
was being called which did set the `@state() #value` field to `null`.
Since `null` is the initial value, this should not have triggered a
re-render but did, because of the Lit bug above: Lit reading `newValue`
in `requestUpdate` incorrectly returned `undefined` for a private field,
hence setting to `null` always failed equality check and incorrectly
triggered an update (compensating for `#recorder` not being marked as
state). The fix to Lit means that nothing was triggering a re-render
after the record button was clicked. Thus ensuring that the `#recorder`
field was properly marked as `@state` is all that's needed.