parse-perfcheck : add filename to csv results

one can find callgrind output file more easilly

Change-Id: Ic5019d5259a63ab23ed44d39baaeb7432690382e
Reviewed-on: https://gerrit.libreoffice.org/12450
Reviewed-by: Riccardo Magliocchetti <riccardo.magliocchetti@gmail.com>
Tested-by: Riccardo Magliocchetti <riccardo.magliocchetti@gmail.com>