Resolve "Custom logo rendering improperly on sign-in page"

What does this MR do?

Fix navigation bar center logo for custom logos

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

Why was this MR needed?

Screenshots (if relevant)

Before After
Screen_Shot_2018-06-20_at_10.21.45_AM Screen_Shot_2018-06-20_at_10.21.20_AM

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Closes #47964 (closed)

Edited by Mike Greiling

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