[NPU] Fix LLaDA2 MoE OOM after the FRACTAL_NZ cast, re-enabling the NZ speedup (#31772)

test/registered/ascend/basic_function/dllm/test_npu_llada2_mini.py

@@ -1,4 +1,3 @@
-import os
 import unittest
 
 from sglang.test.ascend.gsm8k_ascend_mixin import GSM8KAscendMixin
@@ -31,10 +30,6 @@ class TestLLaDA2Mini(GSM8KAscendMixin, CustomTestCase):
         "LowConfidence",  # TODO: Add dLLM configurations
         "--no-dllm-fdfo",  # FDFO (PR #27551) halves single-batch speed on NPU; use sync mode
     ]
-    env = {
-        **os.environ,
-        "SGLANG_NPU_DISABLE_ACL_FORMAT_WEIGHT": "1",  # Need to avoid OOM issue
-    }
     accuracy = 0.88
     output_throughput = 70