fix(chain): redefine relevant txs in `IndexedTxGraph` #281

Job	Run time
Build & Test Examples (example_cli)	40s
Build & Test Examples (example_bitcoind_rpc_polling)	49s
Build & Test Examples (example_electrum)	58s
Build & Test Examples (example_esplora)	56s
Build & Test Examples (example_wallet_electrum)	50s
Build & Test Examples (example_wallet_esplora_async)	57s
Build & Test Examples (example_wallet_esplora_blocking)	1m 8s
Build and test (stable, true, --no-default-features --features miniscript/no-std)	2m 41s
Build & Test Examples (example_wallet_rpc)	36s
Build and test (stable, true, --all-features)	4m 6s
Check no_std	42s
Build and test (1.63.0, --no-default-features --features miniscript/no-std)	4m 42s
Build and test (1.63.0, --all-features)	6m 10s
Check WASM	1m 13s
Rust fmt	14s
prepare	3s
clippy_check	1m 34s
	28m 19s

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