Prevents tax from being re-added on renewals

[JarrydLong]

• Renewals are showing a total amount with tax added onto it again even though it already includes tax
• We're recalculating the charged amount similarly to how we did it in the VAT Tax Add On

[andrewlimaza]

After more thought with this, we need to do this in PMPro core! It is nifty to have this code publicly visible for others but this most likely won't be merged into here.