vim-patch:8.2.3096: temp files remain after running tests

Problem:    Temp files remain after running tests.
Solution:   Delete the right files. (Dominique Pellé, closes vim/vim#8509)

6c72fd51a8

Co-authored-by: Dominique Pelle <dominique.pelle@gmail.com>

test/old/testdir/test_lambda.vim

@@ -329,6 +329,7 @@ func Test_closure_error()
     let caught_932 = 1
   endtry
   call assert_equal(1, caught_932)
+  call delete('Xscript')
 endfunc
 
 " vim: shiftwidth=2 sts=2 expandtab