vim-patch:9.2.0378: Using int as bool type in win_T struct (#39263)

Problem:  Several win_T fields are declared as "int" or "char" but are
          used strictly as boolean flags with TRUE/FALSE values.  The
          integer types obscure the boolean intent and are wider than
          needed.
Solution: Change the following win_T members to bool (stdbool.h) and
          update their assignments from TRUE/FALSE to true/false
          accordingly.

The following conversions have been done:
- int -> bool (10 members):
  w_set_curswant, w_botfill, w_old_botfill, w_do_win_fix_cursor,
  w_popup_fixed, w_border_highlight_isset, w_cline_folded,
  w_redr_status, w_arg_idx_invalid, w_has_scrollbar
- char -> bool (4 members):
  w_topline_was_set, w_ru_empty, w_fold_manual, w_foldinvalid

No existing code compares these members against TRUE/FALSE explicitly or
uses ++/-- / bitwise ops on them, so only plain assignments are
affected.

Excluded:
- w_locked (recursion counter with ++/--),
- w_want_scrollbar (may hold -1 from dict_get_bool),
- w_winbar_height (used in arithmetic and exposed as number via
  getwininfo()).

related: vim/vim#20005
closes:  vim/vim#20008

https://github.com/vim/vim/commit/146d5da0d16b7ea9c767a978cf02384d0831eb92

Co-authored-by: Hirohito Higashi <h.east.727@gmail.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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