mapbox upload set name from filename rather than tileset id about mapbox-cli-py

[perrygeo]

@andrewharvey The CLI was designed specifically to use TILESET as the basis for naming, based on the feedback that keeping tileset name and id consistent was a high priority for our users.

Keeping tileset names consistent with the original filenames is certainly possible with some scripting. But it's not a goal of this project or a high priority for most use cases. Cases where we are streaming data on stdin don't even have a filename at all, which further complicates the notion that filenames should determine naming.

Because current users rely on the behavior of extracting the name from the TILESET, implementing this change would breaking existing scripts. I'm inclined to keep the existing behavior as a result.