remove unused import

Author: Almas Abdrazak

driver-reactive-streams/src/main/com/mongodb/reactivestreams/client/internal/MapReducePublisherImpl.java

@@ -28,7 +28,6 @@
 import com.mongodb.internal.binding.WriteBinding;
 import com.mongodb.internal.client.model.FindOptions;
 import com.mongodb.internal.connection.OperationContext;
-import com.mongodb.internal.operation.AsyncWriteThenReadOperationCursor;
 import com.mongodb.internal.operation.MapReduceAsyncBatchCursor;
 import com.mongodb.internal.operation.MapReduceBatchCursor;
 import com.mongodb.internal.operation.MapReduceStatistics;