[MINOR] Fixing usage of right config value for parallelism to dedup i…

…n Bulk Insert (apache#1905)

hudi-client/src/main/java/org/apache/hudi/table/action/commit/BulkInsertHelper.java

@@ -51,7 +51,7 @@ public static <T extends HoodieRecordPayload<T>> HoodieWriteMetadata bulkInsert(
 
     if (performDedupe) {
       dedupedRecords = WriteHelper.combineOnCondition(config.shouldCombineBeforeInsert(), inputRecords,
-          config.getInsertShuffleParallelism(), ((HoodieTable<T>)table));
+          config.getBulkInsertShuffleParallelism(), ((HoodieTable<T>)table));
     }
 
     final JavaRDD<HoodieRecord<T>> repartitionedRecords;