Update slurm

challenges/slurm/example2/ex2_job_script.pbs

-#!/bin/bash
-
-#PBS -N spring-training-ex2
-#PBS -A birthright-burst
-#PBS -W group_list=cades-birthright
-#PBS -q batch
-#PBS -l qos=burst
-#PBS -l nodes=1:ppn=32
-#PBS -l mem=10g
-#PBS -l walltime=00:10:00
-
-module purge
-module load PE-intel
-module load QE
-
-cd $PBS_O_WORKDIR
-mpirun pw.x -in ../data/in