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)

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    408,
 /**/
     407,
 /**/