[BUG]: zle-line-pre-redraw breaks vi-repeat-change

[Roman Perepelitsa <roman.perepelitsa@xxxxxxxxx>]

If zle-line-pre-redraw is defined, vi-repeat-change behaves as if the
numeric argument was always 1.

To reproduce from `zsh -f`:

  % function zle-line-pre-redraw() {}
  % zle -N zle-line-pre-redraw
  % bindkey -v
  % 123456<ESC><2X><.>

The last line in more detail:

  - "123456" is self-insert
  - ESC is vi-cmd-mode
  - "2X" is vi-backward-delete-char with NUMERIC = 2
  - "." is vi-repeat-change

Expected: BUFFER contains "16".

Actual: BUFFER contains "126".

The actual behavior is unchanged if <.> is replaced with <3.>. The
expected BUFFER in this case is "6".

Roman.