Set rotations properly for landscape default devices

[JSUYA]

+) #19

+)Set only landscape as default for TV profile.

For webapps on TV devices, the default orientation setting is landscape only. This keep the output screen to be display to landscape even if the physical device is portrait mode.
To behave according to the device's orientation(like "all" as webapp, the user can call SystemChrome.setPreferredOrientations() from the app to set it.

SystemChrome.setPreferredOrientations([
      DeviceOrientation.portraitDown,
      DeviceOrientation.portraitUp,
      DeviceOrientation.landscapeLeft,
      DeviceOrientation.landscapeRight,
    ]);