add supercell layer information to forward JTowers

Chiao-Ying Linrequested to merge
cylin/athena:21.3_FixMapping into 21.3

Only FCAL0 jTowers are used for jet seeding, so the information of sampling is expanded in forward region:

FCAL0 : sampling ==2 FCAL1 : sampling ==3 FCAL2 : sampling ==4

Merge request reports