test: remove flaky status for test-statwatcher

test-statwatcher does not appear to be failing anymore in CI. Remove
"flaky" status for the test.

Closes: #21425

PR-URL: #29392
Fixes: #21425
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>

Author: Trott

test/async-hooks/async-hooks.status

@@ -7,12 +7,8 @@ prefix async-hooks
 [true] # This section applies to all platforms
 
 [$system==win32]
-# https://github.com/nodejs/node/issues/21425
-test-statwatcher: PASS,FLAKY
 
 [$system==linux]
-# https://github.com/nodejs/node/issues/21425
-test-statwatcher: PASS,FLAKY
 
 [$system==macos]