test: aix: unflake test_threadsafe_function/test flaky on AIX

[sxa]

This reverts commit 7698480.

Failure was only seen on one machine where an underlying problem has been resolved. This no longer needs to be marked as flaky.

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/71096/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.78%. Comparing base (37e4004) to head (5f1be79).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #61560   +/-   ##
=======================================
  Coverage   89.78%   89.78%           
=======================================
  Files         673      673           
  Lines      203775   203775           
  Branches    39166    39167    +1     
=======================================
+ Hits       182956   182959    +3     
- Misses      13139    13152   +13     
+ Partials     7680     7664   -16     

see 36 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/71100/

[sxa]

CI: https://ci.nodejs.org/job/node-test-pull-request/71100/

Resuming due to smartos test failure:

12:46:56 Failed tests:
12:46:56 out/Release/node /home/iojs/build/workspace/node-test-commit-smartos/nodes/smartos22-x64/test/parallel/test-child-process-fork-closed-channel-segfault.js