Fix debug logging for nodejs pmlog plugin

:Release Notes:
Fix debug logging for nodejs pmlog plugin

:Detailed Notes:
messageid and key-value paramters are not needed for debug
level message. API has been modified to satisfy this missed
out requirement.

:Testing Performed:
Compiled and tested on device, checked that debug messages appeared
properly in the logs.

:QA Notes:

:Issues Addressed:
[GF-51790] nodejs pmlog plugin does not log debug messages

Open-webOS-DCO-1.0-Signed-off-by: Gayathri Srinivasan <gayathri.srinivasan@lge.com>

Change-Id: I239a957dab3a17254c9e142426b37d2081201eba
Reviewed-on: https://g2g.palm.com/3944
Reviewed-by: DCO Verification
Reviewed-by: Gayathri Srinivasan <gayathri.srinivasan@lge.com>
Tested-by: Gayathri Srinivasan <gayathri.srinivasan@lge.com>
Reviewed-by: Keith Derrick <keith.derrick@lge.com>