Fix device selection in pre-join screen for Element Call video rooms (#9321)

* Fix device selection in pre-join screen for Element Call video rooms

As per https://github.com/vector-im/element-call/pull/609

* Update unit test

* Lint

* Hold a media stream while we enumerate device so we can do so reliably.

This means we can remove the device fallback labels.

* i18n

* Remove unnecessary useState

* Fix fetching video devices when video muted

* Actually fix preview stream code

* Fix unit test now fallback is no longer a thing

* Test changing devices

src/models/Call.ts

@@ -771,8 +771,8 @@ export class ElementCall extends Call {
     ): Promise<void> {
         try {
             await this.messaging!.transport.send(ElementWidgetActions.JoinCall, {
-                audioInput: audioInput?.deviceId ?? null,
-                videoInput: videoInput?.deviceId ?? null,
+                audioInput: audioInput?.label ?? null,
+                videoInput: videoInput?.label ?? null,
             });
         } catch (e) {
             throw new Error(`Failed to join call in room ${this.roomId}: ${e}`);