Don't add leading space to the class name - " lazy"

What does this MR do?

Brings back the missing Twitter icon in $user -> Settings -> Account -> Social sign-in.

Are there points in the code the reviewer needs to double check?

I've observed this on the freedesktop.org instance, which is running GitLab Community Edition 10.8.4 2268d0cf on top of Chromium. Other browsers (checked with Firefox) seem unaffected.

Why was this MR needed?

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
• Conform by the code review guidelines
  • Has been reviewed by a UX Designer
  • Has been reviewed by a Frontend maintainer
  • Has been reviewed by a Backend maintainer
  • Has been reviewed by a Database specialist
• Conform by the merge request performance guides
• Conform by the style guides
• If you have multiple commits, please combine them into a few logically organized commits by squashing them
• Internationalization required/considered
• End-to-end tests pass (package-and-qa manual pipeline job)

What are the relevant issue numbers?