vim-patch:8.2.4467: running filetype test leaves file behind (#20335)

Problem:    Running filetype test leaves file behind.
Solution:   Delete the file.
0e71b7d4ce

vim-patch:8.2.4466: MS-Windows: illegal memory access in installer

Problem:    MS-Windows: illegal memory access in installer when using
            "create-directories" as the final argument.
Solution:   Check the argument count. (Cam Sinclair, closes vim/vim#9844)
5c6edf41f9

src/nvim/testdir/test_filetype.vim

@@ -932,7 +932,9 @@ func Test_d_file()
   call assert_equal('d', &filetype)
   bwipe!
 
+  " clean up
   filetype off
+  call delete('Xfile.d')
 endfunc
 
 func Test_dat_file()