Setting timezone on Fuchsia is broken

[iskakaushik]

See: https://ci.chromium.org/p/flutter/builders/prod/Linux%20Fuchsia%20FEMU/194 for the failure.

This caused flutter/flutter#64606, we have temporarily reverted a test here: flutter/engine#20790.

We will want to re-enable the test after this issue is fixed.

cc: @filmil , @zanderso

[zanderso]

/cc @adamlesinski for 0e1d32f10c which was reverted while trying to get the engine tree green, and which probably needs to be re-landed.