[BUG]:shasta tron test netwrok custom RPC doesn't work

**Prerequisites**
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- [x] I checked to make sure that this issue has not already been filed
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**Describe the bug**
shasta tron network is not supported

**To Reproduce**
Steps to reproduce the behavior:
1. Go to 'Settings->Custom RPC'
2. Click on '+ to add a new RPC'
3. Scroll down to 'Tron' and add https://api.shasta.trongrid.io
4. no error just this tron network doesn't work at all

**Expected behavior**
shasta is the main Tron test network
https://api.shasta.trongrid.io
custom RPC doesn't supported at all
no balance or transaction history shown and not possibe to use it

Start by reproducing the issue through Settings → Custom RPC using https://api.shasta.trongrid.io and compare it with a supported Tron network. Trace how the Tron custom RPC is handled, then verify that Shasta balance and transaction history appear and that transactions can be used successfully.

Written by the indexing model from the issue text.