Copter/ExtendedTuning: one more update for 4.7

[rmackay9]

Thanks to PR #3685 the vast majority of fields on the Extended Tuning screen work with 4.7 (and higher) but there's one that doesn't. I think this should be PSC_D_POS_P

[EosBandi]

Fixed. (POSZ was not mentioned in the list of changed params) https://discuss.ardupilot.org/t/copter-4-7-0-beta1-available-for-beta-testing/142738