fix: remove use of non-existent write_code function

Author: sharmaigne

Lib/_pyrepl/windows_console.py

@@ -112,6 +112,7 @@ def __init__(self, err: int | None, descr: str | None = None) -> None:
 MOVE_UP = "\x1b[{}A"
 MOVE_DOWN = "\x1b[{}B"
 CLEAR = "\x1b[H\x1b[J"
+CLEAR_ALL= "\x1b[3J\x1b[2J\x1b[H"
 
 # State of control keys: https://learn.microsoft.com/en-us/windows/console/key-event-record-str
 ALT_ACTIVE = 0x01 | 0x02
@@ -524,9 +525,7 @@ def clear(self) -> None:
 
     def clear_all(self) -> None:
         """Clear screen and scrollback buffer."""
-        os.system("cls")  # This might not clear scrollback
-        # Fallback to ANSI escape sequences if terminal supports them
-        self.write_code("\033[3J\033[2J\033[H")
+        self.__write(CLEAR_ALL)
         self.clear()
 
     def finish(self) -> None: