Use electron as default particle for full reconstruction script

benchmarks/full/full_reconstruction.sh

@@ -82,6 +82,10 @@ if [[ ! -n  "${JUGGLER_N_EVENTS}" ]] ; then
   export JUGGLER_N_EVENTS=1000
 fi
 
+if [[ ! -n  "${PARTICLE}" ]] ; then
+  export PARTICLE="electron"
+fi
+
 if [[ ! -n  "${PMIN}" ]] ; then
   export PMIN=1.0
 fi