Greg Spencer 966d2b9223
Fix ColorScheme example and tests (#150018)
## Description

This fixes the `ColorScheme` example to actually work.  The test had wrapped the app in an additional `MaterialApp`, which allowed the tests to work, but the real problem was using a `context` that was outside the `MaterialApp` to open the bottom sheet, which caused an exception when you actually try to run it interactively.

This fixes the example and the test.

## Tests
 - Fixed the test to not artificially add a second `MaterialApp`.
2024-06-12 05:07:23 +00:00
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