patch 8.1.0169: calling message_filtered() a bit too often

Problem:    Calling message_filtered() a bit too often.
Solution:   Only call message_filtered() when filtering is already false.
diff --git a/src/version.c b/src/version.c
index ce1c55b..2b33f53 100644
--- a/src/version.c
+++ b/src/version.c
@@ -790,6 +790,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    169,
+/**/
     168,
 /**/
     167,