patch 8.1.1636: crash when popup has fitting scrollbar

Problem:    Crash when popup has fitting scrollbar. (Trygve Aaberge)
Solution:   Don't divide by zero if the scrollbar just fits. (closes #4615)
diff --git a/src/version.c b/src/version.c
index 634cd08..2c370da 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1636,
+/**/
     1635,
 /**/
     1634,