Set a default for show zero's

gears/src/main/scala/nl/lumc/sasc/biopet/pipelines/gears/GearsCentrifuge.scala

@@ -19,6 +19,7 @@ class GearsCentrifuge(val root: Configurable) extends QScript with SummaryQScrip
   var outputName: String = _
 
   override def fixedValues = Map("centrifugekreport" -> Map("only_unique" -> false))
+  override def defaults = Map("centrifugekreport" -> Map("show_zeros" -> true))
 
   def init(): Unit = {
     require(fastqR1 != null)