Fix the upper bound of a beetle loop in DeUTSector.h for DetDesc

As checked by @sponce, this MR is needed to fix Moore#946 (closed).

mentioned in merge request !4639 (merged)

added RTA label

You need to run with -T, that is using tcmalloc to reproduce. I'll test this tomorrow morning anyway but I bet it will fix the issue.

changed the description

added bug fix label

resolved all threads

approved this merge request

/ci-test

added ci-test-triggered label

• [2025-04-11 08:04] Validation started with lhcb-master-mr#13326

resolved all threads

merged

mentioned in commit 61c231d3

picked the changes into the branch cherry-pick-61c231d3 with commit 48bf9a69

mentioned in commit 48bf9a69

mentioned in merge request !5029 (merged)

picked the changes into the branch cherry-pick-61c231d3-2 with commit cbdc7ab9

mentioned in commit cbdc7ab9

mentioned in merge request !5030