Fix missing file=efile in IDLE's ExceptionGroup cycle-detection output

The print call for the "exception has printed" message in
print_exc_group was writing to stdout instead of stderr.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: gpshead

Lib/idlelib/run.py

@@ -280,7 +280,7 @@ def print_exc_group(typ, exc, tb, prefix=""):
                     print_exc(type(sub), sub, sub.__traceback__, prefix + "  ")
                 need_print_underline = not isinstance(sub, BaseExceptionGroup)
             else:
-                print(f"{prefix2}  | <exception {type(sub).__name__} has printed>")
+                print(f"{prefix2}  | <exception {type(sub).__name__} has printed>", file=efile)
                 need_print_underline = True
             need_print_underline *= (i == len(exc.exceptions))
             if need_print_underline: