Fix Bug#31704. Do not merge

* lisp/net/tramp.el (tramp-eshell-directory-change):
Use `path-separator' as it does eshell.  (Bug#31704)

lisp/net/tramp.el

@@ -4580,6 +4580,7 @@ Only works for Bourne-like shells."
 	       (or
 		;; When `tramp-own-remote-path' is in `tramp-remote-path',
 		;; the remote path is only set in the session cache.
+                ;; Use `path-separator' as it does eshell.
 		(tramp-get-connection-property
 		 (tramp-get-connection-process v) "remote-path" nil)
 		(tramp-get-connection-property v "remote-path" nil))