flutter_flutter

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Fix DecoratedSliver sample to avoid antialiasing gap (#179848 )

## Description

The DecoratedSliver sample was showing an antialiasing gap between two
adjacent slivers when scrolling on desktop platforms (as reported in
#166822).

The fix uses a single `DecoratedSliver` wrapping a `SliverMainAxisGroup`
instead of two separate `DecoratedSliver` widgets. This eliminates the
gap while still demonstrating the widget effectively.

Fixes https://github.com/flutter/flutter/issues/166822

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] All existing and new tests are passing.

[Contributor Guide]:
https://github.com/flutter/flutter/blob/master/docs/contributing/Tree-hygiene.md#overview
[Tree Hygiene]:
https://github.com/flutter/flutter/blob/master/docs/contributing/Tree-hygiene.md
[test-exempt]:
https://github.com/flutter/flutter/blob/master/docs/contributing/Tree-hygiene.md#tests
[Flutter Style Guide]:
https://github.com/flutter/flutter/blob/master/docs/contributing/Style-guide-for-Flutter-repo.md


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