Remove reply in callback on reply from powerd

:Release Notes:
Fix issue caused by sending reply on LS2 error reply.

:Detailed Notes:
Currently TimePrefsHandler::cbSetPeriodicWakeupPowerDResponse is used
for handling both messages: reply from setting timeout in powerd and
request setTimeWithNTP sent from powerd. Both messages were handled
with LSMEssageReply at the end. But we shouldn't reply on reply from
powerd. So that logic was fixed.

:Testing Performed:
Desktop build with powerd not run and next command:
luna-send -n 1 luna://com.palm.systemservice/time/setTimeWithNTP '{}'

:QA Notes:

:Issues Addressed:
[GF-42136] Segfault in luna-sysservice during response on luna-service2 generated error message (desktop build)

Open-webOS-DCO-1.0-Signed-off-by: Nikolay Orliuk <nikolay.orliuk@lge.com>
Change-Id: Icdac67b2a7fb688ba3c41b325aa10defa9975c0d
Reviewed-on: https://g2g.palm.com/3642
Reviewed-by: Nikolay Orliuk <nikolay.orliuk@lge.com>
Tested-by: Nikolay Orliuk <nikolay.orliuk@lge.com>
Reviewed-by: Build Verification
Reviewed-by: Keith Derrick <keith.derrick@lge.com>