patch 8.1.2190: syntax test fails on Mac

Problem:    Syntax test fails on Mac.
Solution:   Limit the window size to 20 rows.
diff --git a/src/version.c b/src/version.c
index 8360988..caf8ccf 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2190,
+/**/
     2189,
 /**/
     2188,