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/netbeans.c b/src/netbeans.c
index 5bd36a4..003cc53 100644
--- a/src/netbeans.c
+++ b/src/netbeans.c
@@ -2656,7 +2656,10 @@
 
     nb_send(buffer, "netbeans_file_opened");
     if (p_acd && vim_chdirfile(bufp->b_ffname, "auto") == OK)
+    {
+	last_chdir_reason = "netbeans";
 	shorten_fnames(TRUE);
+    }
 }
 
 /*