Group calling: add speaker view

ts/types/Calling.ts

@@ -1,4 +1,4 @@
-// Copyright 2020 Signal Messenger, LLC
+// Copyright 2020-2021 Signal Messenger, LLC
 // SPDX-License-Identifier: AGPL-3.0-only
 
 import { ConversationType } from '../state/ducks/conversations';
@@ -14,6 +14,7 @@ interface ActiveCallBaseType {
   conversation: ConversationType;
   hasLocalAudio: boolean;
   hasLocalVideo: boolean;
+  isInSpeakerView: boolean;
   joinedAt?: number;
   pip: boolean;
   settingsDialogOpen: boolean;