Fix Sbt contract by accessing tracks in the correct manner.

This MR fixes an incorrect contract which was accessing tracks in an incorrect manner.

added bug fix label

mentioned in merge request !663 (merged)

assigned to @msaur

/ci-test --merge

added ci-test-triggered label

• [2021-09-23 11:29] Validation started with lhcb-master-mr#2930

added only GitLab CI label and removed ci-test-triggered label

mentioned in issue Moore#324 (closed)

assigned to @ascarabo and unassigned @msaur

resolved all threads

assigned to @chasse and unassigned @ascarabo

merged

mentioned in commit a23ffcd6

mentioned in issue Moore#335 (closed)

mentioned in issue #283 (closed)

mentioned in merge request !710 (merged)