[Model] Remove unused handle_oov_mm_token (#37321)

Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>

tests/models/multimodal/processing/test_qwen2_5_omni_embed.py

@@ -185,14 +185,16 @@ def make_mock_model(hidden: int = 8):
 
     # super().embed_input_ids → use SupportsMultiModal.embed_input_ids
     def fake_super_embed(
-        ids, mm_embs=None, *, is_multimodal=None, handle_oov_mm_token=False
+        ids,
+        mm_embs=None,
+        *,
+        is_multimodal=None,
     ):
         return SupportsMultiModal.embed_input_ids(
             model,
             ids,
             mm_embs,
             is_multimodal=is_multimodal,
-            handle_oov_mm_token=handle_oov_mm_token,
         )
 
     # Bind embed_input_ids as the real method