[openstreetmap/openstreetmap-website] Map pans to improved position when clicking on directions (#1745)

[Tom Hughes]

Here's my suggestion - it comes in two steps:
* When the popup is created specify `autoPanPadding: [100, 100]` or similar in the options so that there is some padding from the edge of the map when it opens.
* Rather than panning to the popup after opening, pan to the route before doing so by doing `panInsideBounds(polyline.getBounds().pad(0.05))` on the map so that the map pans back to the route but without changing zoom.
That way we ensure the user is looking at the route if they have panned away, and we prevent popups being to close to the edge, but without constantly panning the map to keep it dead centre.

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