fix: use deposit tx hash for lighter (#92)

<!--- Provide a general summary of your changes in the Title above -->

## Description
<!--- Describe your changes in detail -->

## Related Issue Or Context
<!--- If suggesting a new feature or change, please discuss it in an
issue first -->
<!--- If fixing a bug, there should be an issue describing it with steps
to reproduce -->
<!--- Otherwise, describe context and motivation for change herre -->

Closes: #<issue>

## How Has This Been Tested? Testing details.
<!--- Please describe in detail how you tested your changes. -->
<!--- Include details of your testing environment, and the tests you ran
to -->
<!--- see how your change affects other areas of the code, etc. -->

## Types of changes
<!--- What types of changes does your code introduce? Put an `x` in all
the boxes that apply: -->
- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation

## Checklist:
<!--- Go over all the following points, and put an `x` in all the boxes
that apply. -->
<!--- If you're unsure about any of these, don't hesitate to ask. We're
here to help! -->
- [ ] I have commented my code, particularly in hard-to-understand
areas.
- [ ] I have ensured that all acceptance criteria (or expected behavior)
from issue are met
- [ ] I have updated the documentation locally and in docs.
- [ ] I have added tests to cover my changes.
- [ ] I have ensured that all the checks are passing and green, I've
signed the CLA bot

Author: mpetrun5

api/handlers/signing.go

@@ -132,6 +132,7 @@ func (h *SigningHandler) HandleSigning(w http.ResponseWriter, r *http.Request) {
 		{
 			m = lighterMessage.NewLighterMessage(0, b.ChainId, &lighterMessage.LighterData{
 				OrderHash:     b.DepositId,
+				DepositTxHash: b.DepositTxHash,
 				Nonce:         b.Nonce.Int,
 				LiquidityPool: common.HexToAddress(b.LiquidityPool),
 				Caller:        common.HexToAddress(b.Caller),

chains/lighter/message/lighter.go

@@ -84,7 +84,7 @@ func (h *LighterMessageHandler) HandleMessage(m *message.Message) (*proposal.Pro
 		log.Warn().Msgf("Failed to notify relayers because of %s", err)
 	}
 
-	tx, err := h.txFetcher.GetTx(data.OrderHash)
+	tx, err := h.txFetcher.GetTx(data.DepositTxHash)
 	if err != nil {
 		data.ErrChn <- err
 		return nil, err