zlib: use common owner symbol to access JS wrapper

Use the same symbol that other `AsyncWrap` instances also use
for accessing the JS wrapper.

PR-URL: https://github.com/nodejs/node/pull/23189


Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>