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wlheadless: Ignore os.waitpid(-1, 0) error

Niels De Graef requested to merge nielsdg/xwayland-run:nielsdg/waitpid-error into main

There's a chance that all child processes have already stopped running by the time we're cleaning up. If we then try to wait on child processes to finish (using os.waitpid(-1, 0), the function will throw a ChildProcessError, which makes the whole script fail, with the following error message:

Traceback (most recent call last):
  File "/usr/bin/wlheadless-run", line 90, in <module>
    wlheadless_common.cleanup()
    ~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/lib/python3.13/site-packages/wlheadless/wlheadless_common.py", line 151, in cleanup
    self.__cleanup_tempdir()
    ~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/lib/python3.13/site-packages/wlheadless/wlheadless_common.py", line 136, in __cleanup_tempdir
    os.waitpid(-1, 0)
    ~~~~~~~~~~^^^^^^^
ChildProcessError: [Errno 10] No child processes

Just ignore the error if it happens.

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