Upgraded ledger transactions to stargate format

[MonikaCat]

Description

Fixes #529

Checklist

• [x] Targeted PR against correct branch.
• [x] Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• [x] Run meteor npm run lint
• [x] Added an entry to the CHANGELOG.md file.
• [x] Re-reviewed Files changed in the Github PR explorer.

[kwunyeung]

I got this when I would like to sign a vote transaction.

[kwunyeung]

Another error on MsgWithdrawRewards.