sweep: signal tx in markInputFatal

This commit adds the failed tx to the result when marking the input as
fatal, which is used in the commit resolver when handling revoked
outputs.

sweep/sweeper_test.go

@@ -596,7 +596,7 @@ func TestMarkInputFailed(t *testing.T) {
 	}
 
 	// Call the method under test.
-	s.markInputFatal(pi, errors.New("dummy error"))
+	s.markInputFatal(pi, nil, errors.New("dummy error"))
 
 	// Assert the state is updated.
 	require.Equal(t, Fatal, pi.state)