Fix unified HiCache PP test import (#36454)

test/registered/radix_cache/unified_radix_tree/test_unified_radix_cache_hicache_pp_kl.py

@@ -5,11 +5,12 @@ import unittest
 from types import SimpleNamespace
 from urllib.parse import urlparse
 
-from test_unified_radix_cache_kl_nightly import AccuracyTwoPassMixin
-
 from sglang.srt.utils import kill_process_tree
 from sglang.test.ci.ci_register import register_cuda_ci
-from sglang.test.kits.unified_radix_cache_kit import UnifiedRadixTreeTestMixin
+from sglang.test.kits.unified_radix_cache_kit import (
+    AccuracyTwoPassMixin,
+    UnifiedRadixTreeTestMixin,
+)
 from sglang.test.kl_multiturn_utils import get_input_ids
 from sglang.test.test_utils import (
     DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,