Fabian Homborg 06bd1e9347 tests: Check that ctrl-z can be bound
We've heard news of this regressing, so let's add the test that should
have been there already (mea culpa!).

Because we now use POSIX_VDISABLE, this should also work in tandem
with ctrl-space (which sends NUL), but we can't test *that* because
some systems might not have POSIX_VDISABLE.
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