Moderated post/topic styling:
* Actually apply classes that were supposed to be applied.
* Remove coloured icons on hover; they falsely imply that the element is hot.

Bug: 56793
Change-Id: If1ff218d05d80ba5f37ce9fe2c622ac151fa8d9b
Merge "Moderated post/topic styling: * Actually apply classes that were supposed to be applied. * Remove coloured icons on hover; they falsely imply that the element is hot."