src: fix closing weak `HandleWrap`s on GC
In 0af62aae, this was overlooked, with it possibly leading to hard crashes.
Thanks to @bcoe for pointing me to this as the cause of the failure in https://ci.nodejs.org/job/node-test-commit-freebsd/nodes=freebsd11-x64/28455/console.
Refs: https://github.com/nodejs/node/pull/29317
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines