[TfL] Fix white gap below header

I’m not sure where the previous header height measurements came from,
but they were causing a white gap under the map page header.

Standardising on the same 60px height for the header and nav, on both
map pages and regular pages, keeps things simple.

With the white gap fixed, it became apparent that the big blue button
on the /around page was touching the blue TFL logo in the header. So
I added a dark grey line to give some contrast.

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