Impeller playground no longer react to controllers

[dkwingsmt]

Changing the controllers no longer updates the shape.

I've bisected the culprit to be flutter-team-archive/engine#55677 (engine/ea4a00f1c123dcd178129aeac6c8278ef584f2ab ).

After the PR :

The revision before the PR :

Reproduction:

gclient sync
et build -c host_debug_unopt_arm64
../out/host_debug_unopt_arm64/impeller_unittests --enable_playground --timeout=-1 --gtest_filter="Play/EntityTest.DrawSuperEllipse/Metal"

[dkwingsmt]

cc @jonahwilliams

[github-actions]

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