FireFly is subscribing to FabConnect from latest block - not 0

This is a problem, as every node needs to know about every broadcast.

Here's evidence from the FabConnect side
```
[2021-12-02T22:30:32.332Z]  INFO sb-62bd145a-d057-46b9-4d35-70dcfe1fb978: initial block height for subscription (latest block): 10
[2021-12-02T22:30:32.332Z]  INFO Subscribed to events in channel default-channel chaincode firefly_go from block 10 (0 means newest)
```