when downloading from Box, use label for filename

[blancoj]

Fixes #1684

Presently when downloading from Box, the file(s) downloaded take(s) on the name "download". By setting the filename to the label in file_set, this is remedied.

Guidance for testing, such as acceptance criteria or new user interface behaviors:

• When testing this on local, you will have to create an app for box. From this page https://developer.box.com/docs/authenticate-with-developer-token go to the link to "developer console" . There, create an app and in the config section for your new app, you will be able to get the client_id and client_secrete which you will have to update .internal_test_app/config/browse_everything_providers.yml with.

• Either create a new work or Edit an existing work.
• Select the "Files" tab
• Select the button "Add cloud files..."
• Select a few files from Box
• Save the work.
• Go the the work page and try to download the files you just uploaded from Box.
• The files you downloaded should have the appropriate filename

@samvera/hyrax-code-reviewers

[dlpierce]

Box works for me. 👍