Fix memory leak in track base class

10 jobs for trackleak in 9 minutes and 42 seconds (queued for 1 second)
Name Stage Failure
tst:telescope Testing

86% tests passed, 1 tests failed out of 7

Total Test time (real) = 113.59 sec

The following tests FAILED:
5 - test_timepix3tel_ebeam120_gbl.conf (Failed)
Errors while running CTest
ERROR: Job failed: exit code 1