fix: Inconsistent widget bubble focus outline shape (#11345)

# Pull Request Template

## Description

This PR resolves the issue where the focus outline for the standard
bubble type appears as a square in Safari, while it appears circular in
Chrome.

Fixes
[CW-4252](https://linear.app/chatwoot/issue/CW-4252/v41-circle-around-campaign-pop-up-warped),
https://github.com/chatwoot/chatwoot/issues/11327

**Cause**
In Chrome, the focus outline for the standard bubble type is circular,
but in Safari, it appears square. This is due to a 20px margin on the
SVG inside the bubble.

**Solution**
The `20px` margin was removed from the SVG, fixing the focus outline to
appear circular in Safari browser.

## Type of change

- [x] Bug fix (non-breaking change which fixes an issue)

## How Has This Been Tested?

### Loom Video

https://www.loom.com/share/cc4244f369f84b98afaef539b79abcfe?sid=e957df16-1a53-4349-8bdc-705b2ed82d45

### Screenshots
**Before** 

https://www.loom.com/share/e858417722c64df6801ea87e4b89779f?sid=81a0acec-c5f0-4daa-832c-1f23289e2352
<img width="100" alt="image"
src="https://github.com/user-attachments/assets/19c6b62c-96da-485b-9fe8-223065415369"
/>

**After**

https://www.loom.com/share/3946546382884a33a8fef89f81faf7c2?sid=feeaf18c-2b3d-4d4f-bcdf-70335b456dd1
<img width="100" alt="image"
src="https://github.com/user-attachments/assets/0e83d9e3-3153-47ef-9f2d-0a2f7270935c"
/>




## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [ ] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

app/javascript/sdk/sdk.js

@@ -135,7 +135,6 @@ export const SDK_CSS = `
 .woot-widget-bubble svg {
   all: revert;
   height: 24px;
-  margin: 20px;
   width: 24px;
 }