Fix implementation in light of new safety check in tests

Signed-off-by: Sebastian Malton <sebastian@malton.name>

src/common/application-update/selected-update-channel/selected-update-channel.injectable.ts

@@ -19,7 +19,7 @@ const selectedUpdateChannelInjectable = getInjectable({
 
   instantiate: (di): SelectedUpdateChannel => {
     const defaultUpdateChannel = di.inject(defaultUpdateChannelInjectable);
-    const state = observable.box<UpdateChannel>();
+    const state = observable.box<UpdateChannel>(undefined, { deep: false });
 
     return {
       value: computed(() => state.get() ?? defaultUpdateChannel.get()),

src/test-utils/channel-fakes/override-messaging-from-main-to-window.ts

@@ -54,7 +54,7 @@ export const overrideMessagingFromMainToWindow = (): OverriddenWindowMessaging =
       try {
         data = deserialize(serialize(data));
       } catch (error) {
-        throw new Error("Tried to send data that is not compatible with StructuredClone");
+        throw new Error(`Tried to send a message to channel "${channel}" that is not compatible with StructuredClone: ${error}`);
       }
 
       const windowListeners = getWindowListeners(channel, windowId);