getPrimaryBuildsForView: Return all view results

Returning only the first 20 results can cause NixOS/Nixpkgs channel generation to fail, if the first 20 view results correspond to evaluations that haven't finished yet. Then URLs like /view/nixos/tested/latest-finished will return 500 rather than the latest finished view.

Created by  Eelco Dolstra  on April 26, 2013
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