fwts: 18.05.00 -> 18.06.02

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/fwts/versions.

These checks were done:

- built on NixOS
- /nix/store/bs0xv1vsc6zf0cylv6j8iidiwcg9zqx9-fwts-18.06.02/bin/fwts passed the binary check.
- Warning: no invocation of /nix/store/bs0xv1vsc6zf0cylv6j8iidiwcg9zqx9-fwts-18.06.02/bin/kernelscan had a zero exit code or showed the expected version
- 1 of 2 passed binary check by having a zero exit code.
- 0 of 2 passed binary check by having the new version present in output.
- found 18.06.02 with grep in /nix/store/bs0xv1vsc6zf0cylv6j8iidiwcg9zqx9-fwts-18.06.02
- directory tree listing: https://gist.github.com/c871651eb151d0cf25aa751e4e925e27
- du listing: https://gist.github.com/a7b8160c0b4fbc5ed2fa237004865949