[bugfix] tests: include ltx2_3_base in local LTX-2 preset set

hao-ai-lab#1428 fixed this exact assertion in fastvideo/tests/api/test_presets.py
but missed the identical one in tests/local_tests/. Since local_tests are
excluded from CI, test_ltx2_typed_surface_preflight has been failing
since ltx2_3_base was registered in hao-ai-lab#1397.

Author: alanhuangyoo

tests/local_tests/ltx2/test_ltx2_pipeline_smoke.py

@@ -316,9 +316,9 @@ def test_ltx2_typed_surface_preflight() -> None:
         LTX2AudioDecodingStage, LTX2DenoisingStage, LTX2LatentPreparationStage, LTX2TextEncodingStage,
     )
 
-    # All three LTX-2 presets registered.
+    # All four LTX-2 presets registered.
     names = {p.name for p in get_presets_for_family("ltx2")}
-    assert names == {"ltx2_base", "ltx2_distilled", "ltx2_two_stage"}
+    assert names == {"ltx2_base", "ltx2_3_base", "ltx2_distilled", "ltx2_two_stage"}
 
     # Two-stage preset has the denoise + refine topology and pulls its
     # refine allowed_overrides from the typed dataclass.