Fix incorrect failure cause for RIL_REQUEST_SMS_ACKNOWLEDGE

Set 0 instead of Intents.RESULT_SMS_HANDLED(1) for success case.

Bug: 160854387
Test: manual

Signed-off-by: Taesu Lee <taesu82.lee@samsung.com>
Change-Id: Ia90d92bcc791935e20edce38dcdadf99c276535e