[bridge] bug - TokenVault unable to send message with processingFee > 0

[cyberhorsey]

in Bridge.sol when we check the .sendMessage call from TokenVault, we have this check:

        uint256 expectedAmount = message.depositValue +
            message.callValue +
            message.processingFee;
        require(expectedAmount == msg.value, "B:value");

however, when we call it from TokenVault.sendEther, we do this:

        message.gasLimit = gasLimit;
        message.processingFee = processingFee;
        message.depositValue = msg.value;
        message.refundAddress = refundAddress;
        message.memo = memo;

        // Ether are held by the Bridge on L1 and by the EtherVault on L2, not
        // the TokenVault
        bytes32 signal = IBridge(resolve("bridge")).sendMessage{
            value: msg.value
        }(message);

ie: it is imposible for msg.value to be equal to the message.deposit + call + processing amount, because depositValue on message is ALWAYS set to msg.value.