patch 8.2.2854: custom statusline cannot contain % items

Problem:    Custom statusline cannot contain % items.
Solution:   Add "%{% expr %}". (closes #8190)
diff --git a/src/version.c b/src/version.c
index d04ebfb..7635c2f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2854,
+/**/
     2853,
 /**/
     2852,