Revert "[iOS] Disable SupervisedUserWithParentalControlsTestCase"

This reverts commit 57136dc0e8cbadbdb3e18e8f0fae3d04c544e01b.

Reason for revert: Tree closure 
https://ci.chromium.org/ui/p/chromium/builders/ci/ios-device/435105/overview

Bug: 435140688
Original change's description:
> [iOS] Disable SupervisedUserWithParentalControlsTestCase
>
> Tests are failing on device.
>
> Bug: 435140688
> Change-Id: Icf8ac30d6fccbcb7710ab597d953206f790818b9
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6798802
> Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
> Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
> Auto-Submit: Gauthier Ambard <gambard@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1494163}

Bug: 435140688
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: Ibc8ce62b980febba92dccba099685f99302305d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6801803
Auto-Submit: Adem Derinel <derinel@google.com>
Owners-Override: Adem Derinel <derinel@google.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1494186}