Comment unused licenses in whitelist so we don't get warnings

[tjkirch]

Testing done:

Before, we'd always see this:

warning: license was not encountered

    ┌── /home/ANT.AMAZON.COM/tjk/work/thar/sources/deny.toml:22:5 ───
    │
 22 │     "Zlib",
    │     ^^^^^^ no crate used this license
    │

warning: license was not encountered

    ┌── /home/ANT.AMAZON.COM/tjk/work/thar/tools/buildsys/deny.toml:14:5 ───
    │
 14 │     "BSD-2-Clause",
    │     ^^^^^^^^^^^^^^ no crate used this license
    │

warning: license was not encountered

    ┌── /home/ANT.AMAZON.COM/tjk/work/thar/tools/buildsys/deny.toml:21:5 ───
    │
 21 │     "Zlib",
    │     ^^^^^^ no crate used this license
    │

After, no warnings.