Save links from UFO to PFO and tracks in JETM13

Merged Pierre Antoine Delsart requested to merge delsart/athena:ufoconstitLinks into 21.2

The ElementLinks from UFO to PFO and tracks in JETM13 were missing in JETM13. With this MR they will be saved thus allowing more calculation for UFO-based jets. The size increased is of ~1.4%

Edited by Pierre Antoine Delsart

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