Fix AttributeError in DownSample1d filter reference

Author: prishajain1

src/maxdiffusion/models/ltx2/vocoder_ltx2.py

@@ -110,7 +110,7 @@ def __call__(self, x: Array) -> Array:
     if self.use_padding:
       x = jnp.pad(x, ((0, 0), (self.pad_left, self.pad_right), (0, 0)), mode='edge')
 
-    filter_expanded = jnp.repeat(self.filter, num_channels, axis=2)
+    filter_expanded = jnp.repeat(filter, num_channels, axis=2)
     filter_expanded = filter_expanded.astype(x.dtype)
 
     x_filtered = jax.lax.conv_general_dilated(