patch 9.0.0306: buffer write message is two lines in message popup window

Problem:    Buffer write message is two lines in message popup window.
Solution:   Overwrite message if "msg_scroll" is off.
diff --git a/src/version.c b/src/version.c
index e865eb5..b69b74a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -708,6 +708,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    306,
+/**/
     305,
 /**/
     304,