Raise thresholds to reduce LRT electron FTF size

Raise thresholds on electron LRT idperf chain to reduce size of FTF collection. HLT_e5_idperf_loose_lrtloose_L1EM3 to HLT_e20_idperf_loose_lrtloose_L1EM15VH

This is to address truncations raised in ATR-25338. Menu ticket: ATR-25548