Revert "Save gas on IsFeeEnabled (backport #2786) (#2815)"

[colin-axner]

Description

The saving gas commit was backported to the v4.2.x line, but changing gas usage is state machine breaking as GasUsed is included in a transaction response hash which is in consensus. This commit reverts that change. v4.2.1 should then be retracted and replaced with v4.2.2

closes: #XXXX

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[AdityaSripal]

Ack, though I'd like some verification from impacted user that this was the cause of any app hash mismatch

[crodriguezvega]

Good catch, @colin-axner!