[Bug]: Accounts - Update spacing between Wallet and Account groups

### Describe the bug

The current spacing does not visually group the account groups within the wallet.

### Expected behavior

Padding specs needed from Design

### Screenshots/Recordings

### Steps to reproduce

1. Go to Account list
2. Select dropdown
3. View list with multiple Wallets (Import SRP if needed)

### Error messages or log output

```shell

```

### Detection stage

On main branch

### Version

13.5

### Build type

None

### Browser

Chrome

### Operating system

MacOS

### Hardware wallet

_No response_

### Additional context

_No response_

### Severity

_No response_

Start by opening the Account list dropdown with multiple Wallets, following the reproduction steps and comparing the current grouping with the attached screenshot. Obtain the missing padding specifications from Design; done means the Wallet and Account groups have the specified visual spacing.

Written by the indexing model from the issue text.