skip change output amount verification during melt #171

Job	Run time
checks / ruff	6s
checks / formatting	24s
checks / mypy	36s
regtest (3.10, 1.7.1, CoreLightningRestWallet) / regtest	3m 25s
regtest (3.10, 1.7.1, LNbitsWallet) / regtest	3m 27s
regtest (3.10, 1.7.1, LndRestWallet) / regtest	3m 15s
tests (ubuntu-latest, 3.10, 1.7.1, false, true, FakeWallet) / Run (mint-cache-secrets false, mint-only-deprecated true)	2m 32s
tests (ubuntu-latest, 3.10, 1.7.1, true, false, FakeWallet) / Run (mint-cache-secrets true, mint-only-deprecated false)	2m 3s
tests (ubuntu-latest, 3.10, 1.7.1, true, true, FakeWallet) / Run (mint-cache-secrets true, mint-only-deprecated true)	2m 30s
tests (ubuntu-latest, 3.10, 1.7.1, false, false, FakeWallet) / Run (mint-cache-secrets false, mint-only-deprecated false)	2m 1s
	20m 19s

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