patch 8.0.0408: updating folds does not always work properly

Problem:    Updating folds does not work properly when inserting a file and a
            few other situations.
Solution:   Adjust the way folds are updated. (Matthew Malcomson)
diff --git a/src/version.c b/src/version.c
index 39c6b4e..9b350e7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    408,
+/**/
     407,
 /**/
     406,