[BottomNav][iOS] Styling is completely messed up on device rotation

[PeterStaev]

Environment
Provide version numbers for the following components (information can be retrieved by running tns info in your project folder or by inspecting the package.json of the project):

• CLI: 6.1
• Cross-platform modules: 6.1
• Android Runtime: 6.1
• iOS Runtime: 6.1
• Plugin(s):

Describe the bug
When you rotate from portrait to landscape mode the styling of tabs/selection is completely messed up. In the example below the second tab becomes unstyled when the rectangles that were previously styling the tabs are moved and split the first tab:

To Reproduce
https://play.nativescript.org/?template=play-tsc&id=ug5VWz
rotate device to landscape, tested on iPhoneX

Expected behavior
Styling to be applied correctly on device rotation.

Additional context
Related to #6967

[vchimev]

Just for the record, this is an issue not only on iOS 13 but on lower versions as well.