Hopefully fix test_to_csv_single_level_multi_index on Windows

This test was passing even though xfailed, so remove the
raises_if_pyarrow so it will fail due to that (hopefully).

Author: swt2c

pandas/tests/io/formats/test_to_csv.py

@@ -512,12 +512,9 @@ def test_to_csv_single_level_multi_index(
         self, ind, expected, frame_or_series, engine
     ):
         # see gh-19589
-        raises_if_pyarrow = check_raises_if_pyarrow("lineterminator", engine)
         obj = frame_or_series(pd.Series([1], ind, name="data"))
-
-        with raises_if_pyarrow:
-            result = obj.to_csv(lineterminator="\n", header=True, engine=engine)
-            assert result == expected
+        result = obj.to_csv(lineterminator="\n", header=True, engine=engine)
+        assert result == expected
 
     def test_to_csv_string_array_ascii(self, engine):
         # GH 10813