Clear completion list when KeyboardInterrupt occurs

Previously, the completion list would persist after a KeyboardInterrupt
was triggered. This change ensures the completion state is properly reset.

Author: Natural-selection1

Lib/_pyrepl/simple_interact.py

@@ -164,6 +164,8 @@ def maybe_run_command(statement: str) -> bool:
             r = _get_reader()
             if r.input_trans is r.isearch_trans:
                 r.do_cmd(("isearch-end", [""]))
+            if r.cmpltn_menu_choices:
+                r.cmpltn_reset()
             r.pos = len(r.get_unicode())
             r.dirty = True
             r.refresh()