Pinned blog post in layout cards view is wrongly displaying icons

When a blog has the Pinned posts enabled (https://extensions.xwiki.org/xwiki/bin/view/Extension/Blog%20Application#HCardspostlayout), some the blog posts that are pinned have a different layout and all the images are increased in size, resulting in a bigger image for the Like button when using the Silk icon theme.

In the same issue, the comments image from the blog posts should be updated to be dynamically rended as an icon instead of using the hardcoded option that will display a Font Awesome image no matter what icon theme is used.