jpegrecoverymap: Update XMP to match spec.

Remove TransferFunction and PQ metadata from XMP, since they are no
longer needed. Update RangeScalingFactor to MaxContentBoost. Also update
GContainer prefix to Container and correct Item to be its own prefix, in
order to properly conform to GContainer.

In order to still provide a decode flow, default to HLG.

Bug: 264715926
Test: tests pass
Change-Id: I6a94a74666381637c4a7ad301de05cf562c53265