Fixed dropdown link line-height

## What does this MR do?

Fixes line-height issue on dropdown menu links

## Why was this MR needed?

The line-height of some dropdown links were taking the parent, most noticeable the commit header

## Screenshots (if relevant)

Before:

![Screen_Shot_2016-06-08_at_12.26.13](/uploads/51d6bbb4d727da0e3f27d715d6556d4f/Screen_Shot_2016-06-08_at_12.26.13.png)

After:

![Screen_Shot_2016-06-08_at_12.25.03](/uploads/2dcbfaa67982500eef42cfe4247cd54d/Screen_Shot_2016-06-08_at_12.25.03.png)

See merge request !4531