minor: Remove redundant file opening

Author: HugoGGuerrier

utils/impact-db_impacts_gen.py

@@ -43,6 +43,4 @@ def list_impacts(issues: [str]) -> None:
 
 with open("./lkql_checker/share/lkql/kp/kp.json", "w", encoding="utf-8") as f:
     json.dump(impacts, f, ensure_ascii=False, indent=4)
-
-with open("./lkql_checker/share/lkql/kp/kp.json", "a", encoding="utf-8") as f:
     f.write("\n")