Add support Ledger for Polkadex

[Sokol142196]

Describe the task Add support Ledger for Polkadex

[haiyenvu23]

Version test : http://14.224.129.242:8900/s/aHrSxRxCMtq8Stp

• [x] Error when perform sign Transfer with dApp Polkadot js

• [x] Re-check to see if the network supports earning or not This network supports earning.

[haiyenvu23]

Version test : http://14.224.129.242:8900/s/aHrSxRxCMtq8Stp Validation passed in case :

• Install/Update version
• When sign message, sign transaction

• Network supported Earning