[NemotronH] Fix weight-loading unit test broken by Puzzle support (#26522)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

test/registered/unit/models/test_nemotron_h_weight_loading.py

@@ -35,7 +35,7 @@ class _FakeParam:
 class TestNemotronHWeightLoading(unittest.TestCase):
     def _make_minimal_model(self, named_parameters=()):
         model = object.__new__(NemotronHForCausalLM)
-        model.config = SimpleNamespace(n_routed_experts=2)
+        model.config = SimpleNamespace(n_routed_experts=2, max_n_routed_experts=2)
         model.model = SimpleNamespace()
         model.pp_group = _FakePPGroup()
         model.remap_prefix = {}