[Chronik] Fix TxTokenData::from_db

Summary: This currently uses ColoredTx::default() (with outputs = []) when color_tx returns None, which is incorrect, correct is a Vec of None of size tx.outputs.len().

Test Plan: ninja check-functional

Reviewers: Fabien, #bitcoin_abc

Reviewed By: Fabien, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D15411