Resolve "Navigating to another group board breaks navigation sidebar"

What does this MR do?

Stops the sidebar nav state resetting when switching boards.

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

Why was this MR needed?

Screenshots (if relevant)

Oct-02-2017_22-28-47

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Closes #3397 (closed)

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