patch 9.0.0858: "!!sort" in a closed fold sorts too many lines

Problem:    "!!sort" in a closed fold sorts too many lines.
Solution:   Round to end of fold after adding the line count. (closes #11487)
diff --git a/src/version.c b/src/version.c
index 19f0692..981bd54 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    858,
+/**/
     857,
 /**/
     856,