patch 8.2.3617: ":verbose pwd" does not mention 'autochdir' was applied

Problem:    ":verbose pwd" does not mention 'autochdir' was applied.
Solution:   Remember the last chdir was done by 'autochdir'.  (issue #9142)
diff --git a/src/main.c b/src/main.c
index 450fc12..0d77778 100644
--- a/src/main.c
+++ b/src/main.c
@@ -275,7 +275,8 @@
 	 * Hint: to avoid this when typing a command use a forward slash.
 	 * If the cd fails, it doesn't matter.
 	 */
-	(void)vim_chdirfile(params.fname, "drop");
+	if (vim_chdirfile(params.fname, "drop") == OK)
+	    last_chdir_reason = "drop";
 	if (start_dir != NULL)
 	    mch_dirname(start_dir, MAXPATHL);
     }