Fix caption position
Fix caption position

As the image pushes down to 25px, we need to lift it up ( if present ) at least 20px. With a space of 5px between the picture and the caption text.

mchsinx/hexo-theme-next,iissnan/hexo-theme-next,geekrainy/hexo-theme-next,chaoskyme/hexo-theme-next,chaoskyme/hexo-theme-next