chooser fix slash

Author: ben-c-at-moz

choose_ci_set.py

@@ -231,5 +231,7 @@ def dedupe(run_list: list, slash: str) -> list:
         # Dedupe just in case
         run_list = dedupe(run_list, slash)
         run_list = [entry for entry in run_list if os.path.exists(entry.split("::")[0])]
+        if slash == "\\":
+            run_list = [entry.replace("/", slash) for entry in run_list]
         with open(OUTPUT_FILE, "w") as fh:
             fh.write("\n".join(run_list))