fix(node/timers): error when passing id to clearTimeout/clearInterval (#27130)
As pointed out in https://github.com/denoland/deno/issues/27126 we used
a variable which could potentially be of type `number` instead of the
`Timeout` class instance. Ensure that we're always setting `_destroyed`
on the class instead instead.
Fixes https://github.com/denoland/deno/issues/27126