patch 8.2.4157: terminal test fails because Windows sets the title

Problem:    Terminal test fails because Windows sets the title.
Solution:   Add the "vterm_title" testing override and use it in the test.
            (Ozaki Kiichi, closes #9556)
diff --git a/src/testdir/test_terminal.vim b/src/testdir/test_terminal.vim
index 45a3646..4ef977b 100644
--- a/src/testdir/test_terminal.vim
+++ b/src/testdir/test_terminal.vim
@@ -14,6 +14,7 @@
 let $PROMPT_COMMAND=''
 
 func Test_terminal_basic()
+  call test_override('vterm_title', 1)
   au TerminalOpen * let b:done = 'yes'
   let buf = Run_shell_in_terminal({})
 
@@ -37,6 +38,7 @@
   call assert_equal("", bufname(buf))
 
   au! TerminalOpen
+  call test_override('ALL', 0)
   unlet g:job
 endfunc