Revert "Save gas on IsFeeEnabled (backport #2786) (#2814)"

[colin-axner]

Description

This reverts commit dd2c03e.

The saving gas commit was backported to the v4.1.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. v4.1.2 should then be retracted and replaced with v4.1.3

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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]

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

I will contact the user that reported this and ask if they can try it.

[crodriguezvega]

Thank you, @colin-axner!