No indicator for active currency in light mode

Steps:
1. Go to [transfer page](https://solana.tor.us/wallet/transfer)
2. There is no indicator for the active currency as show in the photo below.

Proposed Solution:

https://github.com/torusresearch/solana-wallet/blob/13e6c94bcf1bce6b0befa5f2f2f54be9031f1d46/src/pages/wallet/Transfer.vue#L612-L617

```css
.currency-selector {
@apply py-1 px-4 uppercase text-xs cursor-pointer border-0 text-app-text-500 dark:text-app-text-dark-600;
}

.active-currency {
@apply dark:bg-app-gray-700 border dark:border-0;
}
```

Open src/pages/wallet/Transfer.vue around lines 612-617 and reproduce the currency selector on the transfer page in light mode. Check that the active currency is visually distinct from inactive currencies, then verify the selector in both light and dark modes.

Written by the indexing model from the issue text.