Revert "Grep alias `all' shall not match parent directory"

This reverts commit 856cd948d1.

Emacs got better at quoting shell arguments and the original value
works correctly for vc-git-grep. At the same time, the value
introduced on that commit caused a regression on lgrep.

* lisp/progmodes/grep.el (grep-files-aliases): Use previous value for
`all'. Fixes bug#52367

lisp/progmodes/grep.el

@@ -203,7 +203,7 @@ by `grep-compute-defaults'; to change the default value, use
   :version "22.1")
 
 (defcustom grep-files-aliases
-  '(("all" .   "* .[!.]* ..?*") ;; Don't match `..'. See bug#22577
+  '(("all" .   "* .*")
     ("el" .    "*.el")
     ("ch" .    "*.[ch]")
     ("c" .     "*.c")