[BUG][BITMAP]Java Version BitmapValue deserialized failed when only has 32-bit bitmap

**Describe the bug**
1. add elements to ```org.apache.doris.load.loadv2.dpp.BitmapValue``` which 32-bit bitmap is enough to store
2. Serialize ```BitmapValue```, and then deserialize it will be failed.
This is because the logic of serialization and deserialization is not consistent when ```BitmapValue``` only has 32-bit bitmap
