patch 9.0.1032: test fails when terminal feature is missing

Problem:    Test fails when terminal feature is missing.
Solution:   Use CheckRunVimInTerminal.

src/testdir/test_cmdline.vim

@@ -2486,6 +2486,8 @@ func Test_wildmenu_pum_from_terminal()
 endfunc
 
 func Test_wildmenu_pum_clear_entries()
+  CheckRunVimInTerminal
+
   " This was using freed memory.  Run in a terminal to get the pum to update.
   let lines =<< trim END
     set wildoptions=pum