Fix MR tabs bottom border

What does this MR do?

Fix MR tabs bottom border

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

Why was this MR needed?

Screenshots (if relevant)

Before After
Screen_Shot_2018-06-05_at_3.04.12_PM Screen_Shot_2018-06-05_at_3.03.03_PM

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/46764

Merge request reports

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