Nano "change rep" screen shows wrong current rep
**Describe the bug**
The "Change Representative" screen in nano wallet settings does not show accurate current rep.

**To Reproduce**
Steps to reproduce the behavior:
1. Create a nano wallet.
2. Open the settings menu.
3. Go to Other Settings > Change Representative.
4. Observe the value for Current Representative is wrong.

**Expected behavior**
Current Representative shows the wallet's actual current rep.

**Screenshots**
![image](https://github.com/cake-tech/cake_wallet/assets/5856099/b6b84324-462a-4652-93d4-8b8fce7b8e74)

**Platform:**
 - OS: iOS 17.5.1
 - Device: iPhone 12
 - Cake Wallet Version: 4.18.2


**Additional context**
The rep address is not only wrong, it is not a valid nano address since it starts with "nano_x…" when it must be "nano_1…" or "nano_3…".