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

Describe the bug
Setting View.androidElevation property should not require explicitly setting View.androidDynamicElevationOffset property (it should use its respective default value instead).

To Reproduce

<Button text="TAP" height="80" width="200" style="android-elevation: 0;" />

No shadow on tap (unless android-dynamic-elevation-offset is set as well).
Expected behavior
Default dynamic elevation offset (i.e. shadow) should be applied on button tap.