Back/Escape key callback for Simple Text Field test.
Back/Escape key callback for Simple Text Field test.

* The test can be closed now.

Change-Id: I2f38efe998deb505d67dc969f7c6f16d338a2fc5
Signed-off-by: Victor Cebollada <bd4ca07245b7f4eb2d3ace02513dff6e050d7f4b@samsung.com>

dalihub/dali-demo,dalihub/dali-demo,dalihub/dali-demo,dalihub/dali-demo