tools: remove leftover license boilerplate
tools: remove leftover license boilerplate

This last line was missed in 3e1b1dd4a9ac048105a4dc4cd81578e26d39a1fc

PR-URL: https://github.com/nodejs/node/pull/3225
Reviewed-By: Ben Noordhuis <59bd0a3ff43b32849b319e645d4798d8a5d1e889@bnoordhuis.nl>

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node