fix: remap default rope_type to linear for newer transformers compat

modeling_llada2_moe.py

@@ -101,6 +101,9 @@ class LLaDA2MoeRotaryEmbedding(nn.Module):
             )
         else:
             self.rope_type = "linear"
+        # BC: "default" was removed from ROPE_INIT_FUNCTIONS in newer transformers
+        if self.rope_type == "default":
+            self.rope_type = "linear"
         self.max_seq_len_cached = config.max_position_embeddings
         self.original_max_seq_len = config.max_position_embeddings