change yaml variable name

Author: baltzell

reconstruction/calib/src/main/java/org/jlab/calibration/service/OccupanceEngine.java

@@ -21,7 +21,7 @@ public boolean processDataEventUser(DataEvent event) {
     @Override
     public boolean init() {
         occupancy = new OccupanceDriver(getSchemaFactory(),
-            Integer.parseInt(getEngineConfigString("prescale","100")));
+            Integer.parseInt(getEngineConfigString("occupancyPrescale","100")));
         return true;
     }