fix: Windows/DOS line endings in metadata_raw.tsv

This change fixes errors for tsv-utils downstream processing.
For example:

 [tsv-join] Error processing command line arguments: Windows/DOS line ending found for data/metadata_raw.tsv

ingest/bin/ndjson-to-tsv-and-fasta

@@ -37,7 +37,8 @@ if __name__ == '__main__':
                 args.metadata_columns,
                 restval="",
                 extrasaction='ignore',
-                delimiter='\t'
+                delimiter='\t',
+                lineterminator='\n',
             )
             metadata_csv.writeheader()