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emacsPackages.bpr: fix future preBuild
We conditionally set `preBuild` depending on version. For a new enough version of the `bpr` package, we would set `preBuild` to the `previousAttrs` attrset. This looks like a copy/paste error, so fix it. This code is currently not reachable: it would need a newer version of `bpr`, which has had no changes upstream for several years.