GH-586: Use only maps in the testFixedSizeBinaryWriter

Author: axreldable

vector/src/test/java/org/apache/arrow/vector/TestMapVector.java

@@ -1397,7 +1397,10 @@ public void testFixedSizeBinaryWriter() {
       writer.setPosition(0); // optional
       writer.startMap();
       writer.startEntry();
-      writer.key().fixedSizeBinary(holder1.byteWidth).write(holder1); // need to initialize with byteWidth - NPE otherwise
+      writer
+          .key()
+          .fixedSizeBinary(holder1.byteWidth)
+          .write(holder1); // need to initialize with byteWidth - NPE otherwise
       writer.value().fixedSizeBinary(holder2.byteWidth).write(holder2);
       writer.endEntry();
       holder1.buffer.close();