Tabs getting reset to initial route on modifying device font

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### Version

| Dependency | Version |
| ------------------- | ------------------- |
| react-router-native | 5.2.0 |
| react-router | 5.2.0 |
| react-native | 0.59.8 |

### Expected Behavior
When the device font is changed, the tab should continue from the screen where it was left before closing and opening the app for changing the device font

### Actual Behavior
When the device font is changed, the tab is getting initalized to the first route

### Steps to Reproduce
Navigating to child components in bottom tab, close the app and change the device font in device settings, reopen the app from task view.