Issue:
Bug: [BUG] payment link's checkout widget has visible scrollbars on Windows browsers



### Bug Description

Windows browsers render a visible scrollbar on the checkout widget (which is set to `overflow: auto`).

### Expected Behavior

There shouldn't be any visible scrollbars

### Actual Behavior

There are visible scrollbars

### Steps To Reproduce

Provide an unambiguous set of steps to reproduce this bug. Include code or configuration to reproduce, if relevant.
1. Go to '...'
2. Click on '....'
3. Scroll down to '....'


### Context For The Bug

_No response_

### Environment

Are you using hyperswitch hosted version? Yes/No
If yes, please provide the value of the `x-request-id` response header to help us debug your issue.

If not (or if building/running locally), please provide the following details:
1. Operating System or Linux distribution:
2. Rust version (output of `rustc --version`): ``
3. App version (output of `cargo r --features vergen -- --version`): ``


### Have you spent some time checking if this bug has been raised before?

- [x] I checked and didn't find a similar issue

### Have you read the Contributing Guidelines?

- [x] I have read the [Contributing Guidelines](https://github.com/juspay/hyperswitch/blob/main/docs/CONTRIBUTING.md)

### Are you willing to submit a PR?

Yes, I am willing to submit a PR!

Pull request description:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [x] Bugfix
- [ ] New feature
- [ ] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
This PR hides the visible scrollbars on payment link's checkout widget.

### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

<!--
Provide links to the files with corresponding changes.

Following are the paths where you can find config files:
1. `config`
2. `crates/router/src/configs`
3. `loadtest/config`
-->


## Motivation and Context


## How did you test it?
Can only be tested on windows device. Tested by using below payment link config on windows device

```
"payment_link_config": {
    "payment_link_ui_rules": {
        "#submit": {
            "color": "#003264 !important",
            "padding": "25px 0",
            "fontSize": "19px",
            "fontWeight": "700",
            "borderRadius": "5px",
            "backgroundColor": "#CBB7FF !important"
        },
        "#payment-form-wrap": {
            "width": "100% !important",
            "backgroundColor": "#FFFFFF !important"
        },
        "#payment-form::-webkit-scrollbar": {
            "display": "none"
        }
    }
}
```

## Checklist
<!-- Put an `x` in the boxes that apply -->

- [ ] I formatted the code `cargo +nightly fmt --all`
- [ ] I addressed lints thrown by `cargo clippy`
- [ ] I reviewed the submitted code
- [ ] I added unit tests for my changes where possible


Testing:
Can only be tested on windows device. Tested by using below payment link config on windows device

```
"payment_link_config": {
    "payment_link_ui_rules": {
        "#submit": {
            "color": "#003264 !important",
            "padding": "25px 0",
            "fontSize": "19px",
            "fontWeight": "700",
            "borderRadius": "5px",
            "backgroundColor": "#CBB7FF !important"
        },
        "#payment-form-wrap": {
            "width": "100% !important",
            "backgroundColor": "#FFFFFF !important"
        },
        "#payment-form::-webkit-scrollbar": {
            "display": "none"
        }
    }
}
```

Patch:
diff --git a/crates/router/src/core/payment_link/payment_link_initiate/payment_link.css b/crates/router/src/core/payment_link/payment_link_initiate/payment_link.css
index 37d132fff3a..79ee80573a0 100644
--- a/crates/router/src/core/payment_link/payment_link_initiate/payment_link.css
+++ b/crates/router/src/core/payment_link/payment_link_initiate/payment_link.css
@@ -635,6 +635,10 @@ body {
   text-align: center;
 }
 
+#payment-form::-webkit-scrollbar {
+  display: none;
+}
+
 #submit {
   cursor: pointer;
   margin-top: 20px;