Fix banners section in /cp/board/test/assets in Firefox ESR.
Fix banners section in /cp/board/test/assets in Firefox ESR.

Section was not wrapping to next line properly.
May be specific to Firefox < 42, but easy to work around.

infinity-next/infinity-next,interjection/infinity-next,nextchan/infinity-next,infinity-next/infinity-next,infinity-next/infinity-next,tmrwbo/infinity-next,interjection/infinity-next,nextchan/infinity-next,tmrwbo/infinity-next,interjection/infinity-next,nextchan/infinity-next,tmrwbo/infinity-next,nextchan/infinity-next