patch 8.2.1740: test fails without the terminal feature

Problem:    Test fails without the terminal feature.
Solution:   Skip test if the terminal feature is not available.

src/testdir/test_vim9_script.vim

@@ -2832,6 +2832,8 @@ def Test_unset_any_variable()
 enddef
 
 def Test_define_func_at_command_line()
+  CheckRunVimInTerminal
+
   # run in a separate Vim instance to avoid the script context
   let lines =<< trim END
     func CheckAndQuit()