[openstreetmap/openstreetmap-website] Fixed motorway directions when using OSRM directions (#1738)

[Jamie Guthrie]

The unnamed roads for motorways seems like a really big thing to leave as an unnamed road when the motorway name is listed in `step.ref` without needing to do any text parsing.

To have directions that say _"turn left onto unnamed road"_ when unnamed road is a national highway, seems like a massive oversight, especially when the fix is so easy!

The parsing out of the $east or $west doesn't need to happen, it just makes the output look a lot cleaner.

i.e. `Turn left onto Sunbelt Highway (I5)` instead of `Turn left onto Sunbelt Highway (I5 $east)`.

Even leaving it with the $east tag is **much** better than leaving it as _unnamed road_, although removing the $east tag is better in my opinion although I can understand your reservations.

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