MuonNSW layout - Flip the confirm wedges

Hi everybody,

this MR flips the orientation of the confirm pads in the v11.XML description. I'll upload an update to the MuonSpectrometer-R.09.06.

Let me tag: @chchau, @alaurier, @estel, @sangelid, @pscholer for an review-pending-expert.

Addresses ATLASSIM-6001