feeadjuster: feeadjuster-median-multiplier option is not recognized

[dazl]

Core Lightning v23.02.2 fails to start and logs:

feeadjuster-median-multiplier=0.8: unrecognized option

(context: other options are picked up as expected i.e.

feeadjuster-feestrategy=median
feeadjuster-max-htlc-steps=1

)