`TestInvoiceRegistry` failed with `timeout waiting for HTLC resolution`

[yyforyongyu]

From this build,

--- FAIL: TestInvoiceRegistry (5.18s)
    --- FAIL: TestInvoiceRegistry/FailPartialAMPPayment_Postgres (5.52s)
        invoiceregistry_test.go:154: Creating new Postgres DB 'test_3aa6c30f7146b56e' for testing
        invoiceregistry_test.go:2333: timeout waiting for HTLC resolution