Made the awardable buttons prettier when active

## What does this MR do?

Made the active and hover state of the award emoji buttons prettier.

## Why was this MR needed?

'cause @JobV wanted them to look nicer 😉 

## What are the relevant issue numbers?

Closes #18379 

## Screenshots (if relevant)

![Screen_Shot_2016-06-09_at_09.10.44](/uploads/5ecd0f12679e3484de1ab1d2dbe50cd8/Screen_Shot_2016-06-09_at_09.10.44.png)

See merge request !4554