Fix detected defects from static analysis

:Release Notes:
Fix detected defects from static analysis for zero bug

:Detailed Notes:
- Function SmartKeyService::getAutoReplaceStats: fix possible division by zero;
- PerfTimer::PerfTimer() : non-static class members init.

:Testing Performed:
tested on build

:QA Notes:

:Issues Addressed:
[GF-54506] Coverity issues: smartkey-hun

Open-webOS-DCO-1.0-Signed-off-by: Igor Kuksyuk <igor.kuksiuk@lge.com>

Change-Id: I2e2d91a7832b9daeb953d3af4762bcc99bda05b5
Reviewed-on: https://g2g.palm.com/4157
Reviewed-by: DCO Verification
Reviewed-by: Igor Kuksyuk <igor.kuksiuk@lge.com>
Tested-by: Igor Kuksyuk <igor.kuksiuk@lge.com>
Reviewed-by: Maksym Sditanov <maxim.sditanov@lge.com>
Tested-by: Maksym Sditanov <maxim.sditanov@lge.com>