Test: omit draft_vocab_size to cover EAGLE3 fallback

The EAGLE3 dummy configs in test_eagle3 set draft_vocab_size == vocab_size; omit the field so the new defaulting behavior is exercised.

Signed-off-by: Venky Ganesh <23023424+venkywonka@users.noreply.github.com>

Author: venkywonka

tests/unittest/_torch/speculative/test_eagle3.py

@@ -331,7 +331,6 @@ def test_deepseek_eagle3():
         'transformers_version': '4.52.4',
         'use_cache': True,
         'vocab_size': 129280,
-        'draft_vocab_size': 129280
     }
     with tempfile.TemporaryDirectory() as temp_dir:
         eagle_model_dir = Path(temp_dir)
@@ -433,7 +432,6 @@ def test_multi_eagle3(use_one_model: bool):
         'transformers_version': '4.52.4',
         'use_cache': True,
         'vocab_size': 128256,
-        'draft_vocab_size': 128256
     }
     with tempfile.TemporaryDirectory() as temp_dir:
         eagle_model_dir = Path(temp_dir)