Tap events propagating when isPassThroughParentEnabled = false; #6606

Environment

• CLI: 5.0.1
• Cross-platform modules: 5.0.3
• Android Runtime: 5.0.0
• iOS Runtime: 5.0.0

Describe the bug

Tap events are being propagated to parent objects, even when isPassThroughParentEnabled = false;

To Reproduce

Add nested tap events to the objects, a Label with a tap inside a StackLayout with another tap is enough, the StackLayout event will be fired even when the touch is on the Label.

<ScrollView tap="test">
    <StackLayout tap="test">
       <Label text="Touch this label" tap="test" textWrap="true"/>
    </StackLayout>
</ScrollView>

export function test(args: EventData) {
    (<any>args.object).isPassThroughParentEnabled = false; // This seems to be ignored
    console.log("Touch on " + args.object);
}

Expected behavior

Taps not being propagated when isPassThroughParentEnabled is set to false.

Sample project

https://play.nativescript.org/?template=play-tsc&id=pj7FjN
Tap the label and see a log for each element.

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