fix(perf): retain default float encoding in direct SST fixtures

Signed-off-by: discord9 <55937128+discord9@users.noreply.github.com>

src/cmd/src/bin/query_perf_fixture/direct_sst.rs

@@ -467,6 +467,7 @@ pub(super) async fn run_direct_sst(args: DirectArgs) {
             write_buffer_size: DEFAULT_WRITE_BUFFER_SIZE,
             row_group_size: scenario.layout.row_group_size,
             max_file_size: None,
+            float_field_encoding: Default::default(),
         };
         let infos = match format {
             FormatType::Flat => writer.write_all_flat(source, Some(sequence), &opts).await,