RemoveAppProperty returnvalue fix for failure case

:Release Notes:
RemoveAppProperty returnvalue fix for failure case

:Detailed Notes:
In RemoveAppProperty api implementation no returnvalue
was provided when all the mandatory params were not passed.
Added the corresponding returnvalue for failure case.

:Testing Performed:
Compiled locally and tested on official starfish build 431.

:Issues Addressed:
[GF-54054] RemoveAppProperty is returning true for invalid parameters

Open-webOS-DCO-1.0-Signed-off-by: Ashish Sadre <ashish.sadre@lge.com>

Change-Id: I3313853de4f7521d3d3655d1ab974402e5778928
Reviewed-on: https://g2g.palm.com/4130
Reviewed-by: DCO Verification
Reviewed-by: Ashish Sadre <ashish.sadre@lge.com>
Tested-by: Ashish Sadre <ashish.sadre@lge.com>
Reviewed-by: Premalatha MVS <premalatha.mvs@lge.com>
Reviewed-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>