Disabled award emoji button when user is not logged in

## What does this MR do?

The award emoji buttons are now disabled when the user is not signed in, stopping them from clicking it & then getting an error.

## Screenshots (if relevant)

![Screen_Shot_2016-11-22_at_10.25.20](/uploads/210378bde90e689fbc12940ce271c05e/Screen_Shot_2016-11-22_at_10.25.20.png)

## What are the relevant issue numbers?

Closes #24680

See merge request !7651