pass through keepData flag when creating geometry via viewer

thermion_dart/lib/src/viewer/src/ffi/src/thermion_viewer_ffi.dart

@@ -715,13 +715,9 @@ class ThermionViewerFFI extends ThermionViewer {
     bool keepData = false,
     bool addToScene = true,
   }) async {
-    final asset =
+    final asset = await FilamentApp.instance!.createGeometry(
-        await FilamentApp.instance!.createGeometry(
+        geometry, animationManager,
-              geometry,
+        materialInstances: materialInstances, keepData: keepData) as FFIAsset;
-              animationManager,
-              materialInstances: materialInstances,
-            )
-            as FFIAsset;
     _assets.add(asset);
     if (addToScene) {
       await scene.add(asset);