Fix purge for sandwitchdb engine

:Release Notes:
Turn on purge for sandwitchdb engine

:Detailed Notes:
Uncomment calling of purge engine

:Testing Performed:
Compiled and tested localy.

:QA Notes:

:Issues Addressed:
[BHV-11794] Purge doesn't work with sandwitchdb engine

Open-webOS-DCO-1.0-Signed-off-by: Maksym Sditanov <maxim.sditanov@lge.com>

Change-Id: If2b04e6e68c04e68a0c50a4f23bcf7e91cc3df67
Reviewed-on: https://g2g.palm.com/6280
Reviewed-by: DCO Verification
Tested-by: Maksym Sditanov <maxim.sditanov@lge.com>
Reviewed-by: Kyouhyun Hwang <kyouhyun.hwang@lge.com>
Reviewed-by: Maksym Sditanov <maxim.sditanov@lge.com>