Camera sometimes stops working

### Problem description

When locking the device or bringing the app in the background and then back in the foreground, the camera view might freeze (only happens sometimes). Attempting to capture a picture in this state fails with:

```
Error: Cannot Record
```

Might be related to restarting the app using the reload button.

### Expected behavior

The CameraView should always resume operation when the app becomes active.

### Environment

- Tabris.js version: 3.5.0
- Device: iPad A2197
- OS: iOS 13.6

### Code snippet

Use the camera snippet: https://github.com/eclipsesource/tabris-js/blob/master/snippets/camera.tsx