vty/logging_vty.c: fix writing of 'print category-hex'

Change-Id: I33837f0fac1afe83596fa600916abc05ecb8c356
diff --git a/src/vty/logging_vty.c b/src/vty/logging_vty.c
index f3e1419..9911c6f 100644
--- a/src/vty/logging_vty.c
+++ b/src/vty/logging_vty.c
@@ -906,6 +906,8 @@
 
 	vty_out(vty, " logging color %u%s", tgt->use_color ? 1 : 0,
 		VTY_NEWLINE);
+	vty_out(vty, " logging print category-hex %d%s",
+		tgt->print_category_hex ? 1 : 0, VTY_NEWLINE);
 	vty_out(vty, " logging print category %d%s",
 		tgt->print_category ? 1 : 0, VTY_NEWLINE);
 	if (tgt->print_ext_timestamp)