FTF GPU: Fix the barrel endcap flag readout

Aleksandra Porebarequested to merge
aporeba/athena:ftf-gpu-eta-fix into main

Fix the readout of the barrel_endcap flag during the geometry readout for GPU-accelerated Fast Track Finder.

Screenshot_from_2023-09-28_15-36-37

(note the different y axis limits)

Related to EFTRACK-76

Tagging @demelian @bwynne

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