Fix LTX2 channels-last review scope

Signed-off-by: Hongsheng Liu <liuhongsheng4@huawei.com>

tests/diffusion/test_diffusion_engine.py

@@ -534,18 +534,6 @@ class TestDiffusionCompileConfig:
         with pytest.raises(TypeError, match="diffusion_compile_dynamic"):
             OmniDiffusionConfig(model="test", diffusion_compile_dynamic="false")
 
-    def test_channels_last_3d_is_opt_in_and_strict(self) -> None:
-        assert OmniDiffusionConfig(model="test").vae_use_channels_last_3d is False
-        assert (
-            OmniDiffusionConfig.from_kwargs(
-                model="test",
-                vae_use_channels_last_3d=True,
-            ).vae_use_channels_last_3d
-            is True
-        )
-        with pytest.raises(TypeError, match="vae_use_channels_last_3d"):
-            OmniDiffusionConfig(model="test", vae_use_channels_last_3d="true")
-
     @pytest.mark.parametrize(
         "kwargs, feature",
         [