update Currency Dropdown
# Description
the current currency dropdown doesn't look good and find difficulty for user to select desired currency to pay.
Provide a clear and concise description of what the problem is.

# To reproduce

Steps to reproduce the behavior:

1. Go to 'https://themer.dev/?activeColorSet=dark'
2. Click on 'Currency dropdown at "Pay what you want section currently selected(USD)"'
3. hover on any currency
4. "you will notice the currency only visible ob hover

https://user-images.githubusercontent.com/91718608/226234636-92cbe245-9723-4b26-8769-807e85fb43cf.mp4



## Screenshots

If applicable, add screenshots to help explain your problem.

## Expected behavior

Provide a clear and concise description of what you expected to happen.

# Environment information

## Web UI (themer.dev)

Please fill out the following information if you are using the web UI at [themer.dev](https://themer.dev). For `themer`'s CLI, you can delete this section.

- Device [e.g. iPhone6, MacBook Pro]:
- OS [e.g. iOS, macOS]:
- OS version [e.g. 14]:
- Browser [e.g. Chrome, Safari]:
- Browser version [e.g. 22]:

## CLI or API

Please fill out the following information if you are using the command-line interface or programmatic API. For the web UI, you can delete this section.

- Device [e.g. iPhone6, MacBook Pro]:
- OS [e.g. iOS, macOS]:
- OS version [e.g. 14.0]:
- Node version [e.g. 14.4.0]:
- `themer` version [e.g. 5.0.0]:

# Additional context

Add any other context about the problem here.
