patch 8.2.3622: "verbose pwd" shows confusing info

Problem:    "verbose pwd" shows confusing info when :lcd does not change
            directory.
Solution:   Clear last_chdir_reason also when the directory does not change.
            (closes #9160)
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index aae34f9..76511de 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -7301,6 +7301,7 @@
 	VIM_CLEAR(globaldir);
     }
 
+    last_chdir_reason = NULL;
     shorten_fnames(TRUE);
 }
 
@@ -7390,7 +7391,6 @@
 
 	if (dir_differs)
 	{
-	    last_chdir_reason = NULL;
 	    if (scope == CDSCOPE_WINDOW)
 		acmd_fname = (char_u *)"window";
 	    else if (scope == CDSCOPE_TABPAGE)