[explorer] Patch error failures on slp v2 txs

Summary:
T3214

Render SLP v2 txs as eCash txs instead of rendering error page.

This diff implements the same fix used on explorer.be.cash. Ref:

https://github.com/raipay/explorer/commit/d705dc33930a5cba9cd065343d01a13f3b5b34ee
https://github.com/raipay/explorer/commit/a3b6945a30b406c1a615b13dbf8e643739485239

Test Plan: Start explorer, test the error txs from the task, test an slp v1 token tx and renders ok

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D14552