fix: color-rg-project-root-dir in emacs 29

[C1tas]

27+ should use (car (last project)) to get project dir str
so switch the condition

29运行时发现此处的版本判断顺序应当调整一下，或直接调整if代码块中内容，但调整判断顺序更为便捷

[manateelazycat]

请测试一下 emacs28, 我发现 emacs28 和 emacs29 很不一样。

[C1tas]

测试环境
"GNU Emacs 28.1.90 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.34, cairo version 1.17.6)
of 2022-07-05"

"GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.33, cairo version 1.17.6)
of 2022-04-19"

看能否采取如下复合判断策略，单一 version< 可能导致低版本判断错误

(defun color-rg-project-root-dir ()
  (let ((project (project-current)))
    (if project
        (cond
         ;; 27 <= <= 28
         ((and
           (version< "27" emacs-version)
           (version< emacs-version "29")) (expand-file-name (cdr project)))
         ;; >= 29
         ((version<= "29" emacs-version) (expand-file-name (car (last project))))
         (t default-directory)))))

目前这28,29两个版本测试 color-rg-seach-input-in-project 表现正常

[manateelazycat]

谢谢