patch 8.2.0231: silent system command may clear the screen

Problem:    Silent system command may clear the screen.
Solution:   Do not clear the screen in t_te.
diff --git a/src/version.c b/src/version.c
index 8bd7d10..db1f9f7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    231,
+/**/
     230,
 /**/
     229,