MAINT: Simplify bugfix for even rfft #26360
Merged
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Backport of #26359.
This is a slightly improved fix for #26349, which changes the code to actually do what a comment stated it would, making the fix from #26354 no longer necessary. Of course, it keeps the tests, so that we can be sure the fix actually is correct.
Ideally, backported for 2.0.0 as well.