Add batchfile title, do not use /wait

Recommended in https://ss64.com/nt/start.html
/wait makes vim-plug sync when vim-plug should be async.

Author: janlazo

plug.vim

@@ -373,7 +373,7 @@ if s:is_win
     if &shell =~# 'powershell\.exe'
       let cmd = '& ' . cmd
     elseif !has('nvim') && !has('gui_running') && &shell =~# 'cmd\.exe'
-      let cmd = 'start /wait /min ' . cmd
+      let cmd = 'start ' . plug#shellescape('fzf', {'script': 0}) . ' /min ' . cmd
     endif
     return [batchfile, cmd]
   endfunction