Environment

• CLI: 5.4.0
• Cross-platform modules:5.4.0
• Android Runtime:5.4.0
• iOS Runtime:5.4.0

Describe the bug
The ListPicker will not update the UI when a new item in the ListPicker's source array is added.

Sample project
https://play.nativescript.org/?template=play-tsc&id=gT6D1T

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