Fix incorrect skip check in test_backend_ps. #26955
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There was a typo in
elif rcParams.get("ps.userdistiller") == "xpdf"
which effectively always returned False (the correct spelling is "ps.usedistiller", so the get() call always returned None), which made the skip check for xpdf never run. Thus, running the test on a machine without pdftops installed would eventually result in an ExecutableNotFoundError when matplotlib actually tries to call the distiller.To avoid this kind of problems (dict.get hiding typos), directly update the test-specific settings into the main rcParams, and use normal brackets to access rcParams entries, as rcParams keys are a fixed set anyways.
This broke the mplcairo test suite (where I didn't bother configuring CI to have pdftops installed) so labeling as 3.8.1; "somewhat" release critical (though I guess I could just xfail the test on mplcairo's side instead).
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