Fix Eshell incompatibility with "[" command when eshell-pred is disabled

Fix Eshell incompatibility with "[" command when eshell-pred is disabled

* lisp/eshell/em-pred.el (eshell-pred-initialize): Ensure that
'eshell-parse-arg-modifier' is called before 'eshell-parse-glob-chars'.

* lisp/eshell/em-glob.el (eshell-glob-initialize): Use a number for hook
depth to be clearer.
(eshell-parse-glob-chars): Simplify; since eshell-pred's hook now runs
first, the extra code is no longer necessary.

* test/lisp/eshell/em-glob-tests.el
(em-glob-test/test-command-without-pred): New test.

(cherry picked from commit 523aade3ea11c188e30e3889f031d1848129cf82)