Update some constants used for decoding gFEX TOBs

Cecilia Toscirirequested to merge
ctosciri/athena-old:gFEX_BSfix into 22.0

With this MR, a bug in the gFEX TOBs decoder is fixed: a few constants used in the decoder are now updated to their correct values.

Jira: ATR-25495

Edited by Rafal Bielski

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