Bruno Leroux e02d29d52e
Fix InputDecorator.prefixIcon color when disabled (#149595)
## Description

This PRs makes the `InputDecoration.prefixIcon` color compliant with the M3 spec.

From M3 spec, the color should be `onSurface.withOpacity(0.38)`, see https://m3.material.io/components/text-fields/specs#e4964192-72ad-414f-85b4-4b4357abb83c

![image](https://github.com/flutter/flutter/assets/840911/298d9aaf-fcda-479a-a8dd-0ee84db98242)

## Related Issue

Fixes https://github.com/flutter/flutter/issues/149411.

## Tests

Updates 2 tests.
2024-06-03 18:53:16 +00:00
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