Fix example code in curses tutorial (python#126446)

Author: yi-jiayu

Doc/howto/curses.rst

@@ -145,8 +145,8 @@ importing the :func:`curses.wrapper` function and using it like this::
            v = i-10
            stdscr.addstr(i, 0, '10 divided by {} is {}'.format(v, 10/v))
 
-       stdscr.refresh()
-       stdscr.getkey()
+           stdscr.refresh()
+           stdscr.getkey()
 
    wrapper(main)