patch 8.2.3803: GUI: crash with 'writedelay' set using a terminal window

Problem:    Crash when 'writedelay' is set and using a terminal window to
            execute a shell command.
Solution:   Check that "tl_vterm" isn't NULL. (closes #9346)

src/version.c

@@ -749,6 +749,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3803,
 /**/
     3802,
 /**/