DerivationFrameworkJetEtMiss: Explicitly lock overlap removal decorations.

DerivationFrameworkJetEtMiss: Explicitly lock overlap removal decorations.

The overlap removal algorithm leaves its decorations unlocked,
so schedule an explicit LockDecorations algorithm.  It's problematic
to do this within the overlap removal algorithm itself  because we
actually schedule two such algorithms, the second overwriting most of the
decorations produced by the first.

This is is not MT-friendly, but this should get things working
in the face of ATLASRECTS-8008.