Restoring previous default detector to topside, ecal benchmarks work for both detectors

benchmarks/barrel_ecal/run_emcal_barrel_electrons.sh

 #!/bin/bash
 
 if [[ ! -n  "${JUGGLER_DETECTOR}" ]] ; then 
-  export JUGGLER_DETECTOR="reference_detector"
+  export JUGGLER_DETECTOR="topside"
 fi
 
 if [[ ! -n  "${JUGGLER_N_EVENTS}" ]] ; then 

benchmarks/barrel_ecal/run_emcal_barrel_particles.sh

 #!/bin/bash
 
 if [[ ! -n  "${JUGGLER_DETECTOR}" ]] ; then 
-  export JUGGLER_DETECTOR="reference_detector"
+  export JUGGLER_DETECTOR="topside"
 fi
 
 if [[ ! -n  "${JUGGLER_N_EVENTS}" ]] ; then