patch 9.0.0099: scrollback can be wrong after redrawing the command line

Problem:    Scrollback can be wrong after redrawing the command line.
Solution:   Clear unfinished scrollback when redrawing. (closes #10807)
diff --git a/src/version.c b/src/version.c
index e576860..c0a0315 100644
--- a/src/version.c
+++ b/src/version.c
@@ -736,6 +736,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    99,
+/**/
     98,
 /**/
     97,