[UI][Tizen] Adopt a simple layout scheme for TizenSystemIndicator landscape

Now TizenSystemIndicator in landscape mode will adopt a simple layout
scheme, the same as the portrait mode.

This is a palliative solution, while we don't implement the overlaying
layout and the event support in landscape mode.
Merge pull request #1291 from ricardotk/indicator

[UI][Tizen] Adopt a simple layout scheme for TizenSystemIndicator landscape