Fix spacing in commit view of MR

What does this MR do and why?

When using gl-avatar, there was no spacing between avatar and commit title on the inidividual commit view of an MR anymore.

Screenshots or screen recordings

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Before	After

How to enable locally

1. Run bin/rails c
2. Wait until everything has loaded
3. Run Feature.enable(:gl_avatar_for_all_user_avatars)

MR acceptance checklist

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