style: Fix Servo_IsCssPropertyRecordedInUseCounter so that we also report disabled properties.
style: Fix Servo_IsCssPropertyRecordedInUseCounter so that we also report disabled properties.

When zoom is disabled, we still count it, but with the current code the testing
function will throw instead of returning the right value, which means we'd fail
layout/style/test/test_use_counters.html.

Differential Revision: https://phabricator.services.mozilla.com/D55005

KiChjang/servo,DominoTree/servo,splav/servo,DominoTree/servo,KiChjang/servo,KiChjang/servo,DominoTree/servo,KiChjang/servo,DominoTree/servo,splav/servo,splav/servo,KiChjang/servo,splav/servo,KiChjang/servo,splav/servo,KiChjang/servo,KiChjang/servo,DominoTree/servo,DominoTree/servo,splav/servo,DominoTree/servo,KiChjang/servo,splav/servo,splav/servo,DominoTree/servo,splav/servo,DominoTree/servo,splav/servo,KiChjang/servo,DominoTree/servo