[material_ui] Remove !chrome in text_field_test.dart

[ValentinVignal]

Part of flutter/flutter#92134

It seems the issue is already closed and fixed, so I'm attempting to remove this TODO

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Code Review

This pull request removes the @TestOn('!chrome') annotation and the associated TODO comment from packages/material_ui/test/text_field_test.dart, enabling the test suite to run on Chrome. There are no review comments, and I have no feedback to provide.