Remove KMP_DUPLICATE_LIB_OK=TRUE

Author: CuiYifeng

.github/workflows/_windows_ut.yml

@@ -148,6 +148,5 @@ jobs:
           call conda activate windows_ci
           call "C:\Program Files (x86)\Intel\oneAPI\setvars.bat"
           set PYTORCH_TEST_WITH_SLOW=1
-          set KMP_DUPLICATE_LIB_OK=TRUE
           cd ../pytorch/third_party/torch-xpu-ops/test/xpu/extended/
           python run_test_with_skip_mtl.py