fix: custody keyring name (#3803)

## Explanation

This PR updates the custody keyring name and removes the need for a
patch to be used in the extension client.

## References

* [Fixes #216
](MetaMask/accounts-planning#216)
## Changelog

### `@metamask/keyring-controller`

- **UPDATES**: The custody keyring type name from `Custody` to `Custody
JSONRPC`

## Checklist

- [x] I've updated the test suite for new or updated code as appropriate
- [x] I've updated documentation (JSDoc, Markdown, etc.) for new or
updated code as appropriate
- [ ] I've highlighted breaking changes using the "BREAKING" category
above as appropriate

packages/keyring-controller/src/KeyringController.ts

@@ -52,7 +52,7 @@ export enum KeyringTypes {
   ledger = 'Ledger Hardware',
   lattice = 'Lattice Hardware',
   snap = 'Snap Keyring',
-  custody = 'Custody',
+  custody = 'Custody - JSONRPC',
 }
 
 /**