Bugfix of the globalEta variable in the jFEX EDMs

Sergi Rodriguez Boscarequested to merge
serodrig/athena:updateEDM into 22.0

This MR is meant to solve a problem with the globalEta into the EDM. This will be reflected on the eta coordinate on the C-side (using the mirroring symmetry as the firmware does)

Tagging @tamartin for his information

Edited by Sergi Rodriguez Bosca

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