ATR-27505 gFEX updates for menu

Zhongyukun Xurequested to merge
zhongyuk/athena:master-my-topic into 23.0

Increase gLJ seedThrA, seedThrB and seedThrC from 3 to 20 GeV. Decrease gXE seedThrA, seedThrB and seedThrC from 25 to 24 GeV.

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