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ITU-R BS.1770 assigns a weight of 1.0 to height channels, but the filter included the top-back channels in the 1.41 surround mask. remove the top-back channels from that mask and add a FATE test for the resulting loudness measurement. fixes #23968. Signed-off-by: Ayoub Nabil <237098474+ayoubnabil@users.noreply.github.com>