[NUI] Fix the return value of logicalKey (#1062)

- Should return 'ret' value of string type

Signed-off-by: Seoyeon Kim <seoyeon2.kim@samsung.com>

diff --git a/src/Tizen.NUI/src/public/Key.cs b/src/Tizen.NUI/src/public/Key.cs
index 7e11b26..58fd163 100755 (executable)
--- a/src/Tizen.NUI/src/public/Key.cs
+++ b/src/Tizen.NUI/src/public/Key.cs
@@ -365,7 +365,7 @@ namespace Tizen.NUI
             {
                 string ret = Interop.Key.Key_logicalKey_get(swigCPtr);
                 if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
-                return "";
+                return ret;
             }
         }