starius / btcd / 28569657741

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psbt: compact witness utxo scripts after parsing

wire.ReadTxOut returns PkScript slices backed by its internal 4 MiB
script slab. PSBT inputs keep parsed WitnessUtxo values, so small
scripts could otherwise keep the whole slab live.

Copy the script before storing the TxOut and assert the parsed witness
script has compact capacity.

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