patch 8.2.0125: :mode no longer works for any system

Problem:    :mode no longer works for any system.
Solution:   Always give an error message.
diff --git a/src/version.c b/src/version.c
index a32231b..1ed040d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    125,
+/**/
     124,
 /**/
     123,