Add a defautl for WebRTC device settings

Signed-off-by: Šimon Brandner <[email protected]>

Author: SimonBrandner

src/settings/Settings.tsx

@@ -569,15 +569,15 @@ export const SETTINGS: {[setting: string]: ISetting} = {
     },
     "webrtc_audiooutput": {
         supportedLevels: LEVELS_DEVICE_ONLY_SETTINGS,
-        default: null,
+        default: "default",
     },
     "webrtc_audioinput": {
         supportedLevels: LEVELS_DEVICE_ONLY_SETTINGS,
-        default: null,
+        default: "default",
     },
     "webrtc_videoinput": {
         supportedLevels: LEVELS_DEVICE_ONLY_SETTINGS,
-        default: null,
+        default: "default",
     },
     "language": {
         supportedLevels: LEVELS_DEVICE_ONLY_SETTINGS_WITH_CONFIG,