[jvm-packages] fix group col for gpu packages (dmlc#10254)

Author: wbo4958

jvm-packages/xgboost4j-spark-gpu/src/main/scala/ml/dmlc/xgboost4j/scala/rapids/spark/GpuPreXGBoost.scala

@@ -160,7 +160,7 @@ object GpuPreXGBoost extends PreXGBoostProvider {
 
     // Check columns and build column data batch
     val trainingData = GpuUtils.buildColumnDataBatch(feturesCols,
-      labelName, weightName, marginName, "", castedDF)
+      labelName, weightName, marginName, groupName, castedDF)
 
     // eval map
     val evalDataMap = evalSets.map {