Fix SpamTest

:Release Notes:
Fix precondition mount option for SpamTest

:Detailed Notes:

:Testing Performed:
Compiled and tested localy.

:QA Notes:

:Issues Addressed:
[BHV-1214] SpamTest - fix mount rule

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

Change-Id: I194f4603d51b1cc2a73b4aaf8aa86515b7f4dd18
Reviewed-on: https://g2g.palm.com/4801
Reviewed-by: DCO Verification
Tested-by: Maksym Sditanov <maxim.sditanov@lge.com>
Reviewed-by: Maksym Sditanov <maxim.sditanov@lge.com>