## **Description**
- BottomSheetDialog's current fullscreen behavior attaches the Dialog to
the top of the screen instead of letting the height be dictated by the
maxScreenHeight, which factors in the safe area inset. This PR removes
the absolute `top:0` position of isFullscreen behavior

## **Related issues**

Fixes: 

## **Manual testing steps**

1. Go to Metamask Portfolio
2. Connect an account
3.

## **Screenshots/Recordings**

<!-- If applicable, add screenshots and/or recordings to visualize the
before and after of your change. -->

### **Before**

https://github.com/MetaMask/metamask-mobile/assets/14355083/f8dcc940-ea6e-4532-b76d-9dabf03b42a9

<!-- [screenshots/recordings] -->

### **After**

https://github.com/MetaMask/metamask-mobile/assets/14355083/c366f833-7efc-4d2e-b480-8fe0b67fc778

<!-- [screenshots/recordings] -->

## **Pre-merge author checklist**

- [x] I’ve followed [MetaMask Coding
Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [x] I've clearly explained what problem this PR is solving and how it
is solved.
- [x] I've linked related issues
- [x] I've included manual testing steps
- [x] I've included screenshots/recordings if applicable
- [ ] I’ve included tests if applicable
- [x] I’ve documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [x] I’ve applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.
- [x] I’ve properly set the pull request status:
  - [ ] In case it's not yet "ready for review", I've set it to "draft".
- [ ] In case it's "ready for review", I've changed it from "draft" to
"non-draft".

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.