patch 8.1.0554: popup menu overlaps with preview window

Problem:    Popup menu overlaps with preview window.
Solution:   Adjust the height computation. (Hirohito Higashi, closes #3414)
diff --git a/src/version.c b/src/version.c
index 5f61775..6cce566 100644
--- a/src/version.c
+++ b/src/version.c
@@ -793,6 +793,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    554,
+/**/
     553,
 /**/
     552,