Tours link lacks padding on smaller screens

As reported in https://meta.trac.wordpress.org/ticket/7706
> Tours link lacks padding on smaller screens
open meta home page https://make.wordpress.org/meta/
check the screen to 320px width
Tour word sticks to left side without any spaces.

A potential fix is included in https://meta.trac.wordpress.org/ticket/7706#comment:1
> Admin bar styles remove padding from links, including the Tours link, at smaller screen sizes.

Open the meta home page at https://make.wordpress.org/meta/ and reproduce the issue at 320px width. Read the linked Meta Trac ticket, especially comment 1, and inspect the admin bar styles that remove padding from small-screen links. Done means the Tours link has visible horizontal spacing on smaller screens.

Written by the indexing model from the issue text.