Block overview graph has missing tx fee data

[losh11]

We expect transactions in the block graph to have different colours, representing the tx fee rate. However the frontend believes that all transactions have a 0lit/kb fee rate.

This seems to be an issue with the backend API responsible for sending tx fee summaries.
/api/v1/block/:blockhash/summary is the only known endpoint with this issue.

https://litecoinspace.org/api/v1/block/730e939c69dd6c2d67d480f034dc18de04bbf828782d5a029639685237cf1f54/summary