patch 8.2.2447: 'foldlevel' not applied to folds restored from session

Problem:    'foldlevel' not applied to folds restored from session.
Solution:   Set 'foldlevel' after creaiting the folds. (closes #7767)
diff --git a/src/version.c b/src/version.c
index bba9da8..61acfad 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2447,
+/**/
     2446,
 /**/
     2445,