[issue37011] pdb: restore original tracing function instead of sys.settrace(None)

[daniel hahler]

daniel hahler <python-bugs at thequod.de> added the comment:

I've just found that I've created an issue with regard to `do_debug` for this already (https://bugs.python.org/issue36388), and a PR: https://github.com/python/cpython/pull/12479.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37011>
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