Merge branch 'project-list-icons-width' into 'master'

Fixed width on project visibility icon in project list

## What does this MR do?

Gives fixed width to the project visibility icons in the project list so that they all correctly line up with each other.

## What are the relevant issue numbers?

Closes #19583 

## Screenshots (if relevant)

![Screen_Shot_2016-07-07_at_12.49.58](/uploads/bffa097c5c0e0a1339bbd4d7ea15d84f/Screen_Shot_2016-07-07_at_12.49.58.png)

See merge request !5137