NV: US6BusEly

[Duke87]

So, I don't think this is actually a thing. Drove the theoretical route this past week, there are zero shields posted. The closest thing that exists to a sign for it is this, which... yeah I don't think that counts.

Meanwhile the portion that isn't concurrent with US50 is a narrow residential street (with a posted speed limit of 20!) that according to NDOT's GIS is owned/maintained by the city of Ely.

Recommend deleting, therefore.

[oscar]

^ I'll address this once I'm back home in a few days.

[oscar]

Belatedly removing US6BusEly, as unsigned. Some business routes in NV are locally-maintained, but being unsigned is good enough.

https://github.com/TravelMapping/HighwayData/pull/6066
https://github.com/TravelMapping/HighwayData/pull/6067 (Updates item)