correcting conditional

Co-authored-by: Irv Lustig <[email protected]>

Author: kirill-bash

tests/test_frame.py

@@ -383,7 +383,7 @@ def test_types_drop_duplicates() -> None:
     check(assert_type(df.drop_duplicates(("AAA",)), pd.DataFrame), pd.DataFrame)
     check(assert_type(df.drop_duplicates("AAA"), pd.DataFrame), pd.DataFrame)
 
-    if PD_LTE_22:
+    if not PD_LTE_22:
         check(assert_type(df.drop_duplicates({"AAA"}), pd.DataFrame), pd.DataFrame)
         check(assert_type(df.drop_duplicates({"AAA": None}), pd.DataFrame), pd.DataFrame)