patch 8.0.0407: filtering folds with marker method not tested

Problem:    Filtering folds with marker method not tested.
Solution:   Also set 'foldmethod' to "marker".
diff --git a/src/version.c b/src/version.c
index cc69b3c..39c6b4e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    407,
+/**/
     406,
 /**/
     405,