Bug#891889: ballz-data license is listed incorrectly

[Julie Marchant]

Package: ballz-data
Version: 1.0.3-1

I have investigated the GitLab repository of B.A.L.L.Z. (packages:
ballz, ballz-data) and found that the license of the ballz-data package
is incorrectly indicated. The GitLab repository is here:

https://gitlab.com/ballz/ballz/

And the COPYING file states the following:

"All source under the src directory is licensed under the BSD license except
the source under the src/dumb directory which is licensed under the Dumb
license."

As you can see, the license notice is specifically for the source code,
*not* the data. No license is given for the data. As such, ballz-data
should be moved to non-free, and ballz should be moved to contrib,
unless one of the following is done:

1. The author of the game is contacted, requested to provide a license
for the data, and does so; or

2. Someone replaces everything in ballz-data with a DFSG version.