Upgrade number of procs on lm3 (https://gogs.elic.ucl.ac.be/pbarriat/ecearth_patch/issues/17#issuecomment-477)

3.3.0/runtime/classic/lemaitre3.sh.tmpl

@@ -3,7 +3,7 @@
 #SBATCH --job-name=ece3
 #SBATCH --time=06:00:00
 #
-#SBATCH --ntasks=144
+#SBATCH --ntasks=408
 #SBATCH --mem-per-cpu=3072
 #
 #SBATCH --mail-user=francois.massonnet@uclouvain.be