Make statusline blank in hunk preview window

I would prefer to remove the statusline altogether in the hunk preview
window, making it consistent with the floating preview window.  However
I do not think that is possible; the best one can do is make it blank.

autoload/gitgutter/hunk.vim

@@ -475,6 +475,7 @@ function! s:open_hunk_preview_window()
     doautocmd WinEnter
     set previewwindow
   endif
+  setlocal statusline=%{''}
   if exists('*win_getid')
     let s:winid = win_getid()
   else