Remove unnecessary dtype conversion in icechunk writer (#760)

Co-authored-by: Tom Nicholas <[email protected]>
Co-authored-by: Max Jones <[email protected]>

Author: 3 people

virtualizarr/writers/icechunk.py

@@ -419,7 +419,7 @@ def write_virtual_variable_to_icechunk(
             name=name,
             shape=metadata.shape,
             chunks=metadata.chunks,
-            dtype=metadata.data_type.to_native_dtype(),
+            dtype=metadata.data_type,
             filters=filters,
             compressors=compressors,
             serializer=serializer,