LOS: Added trailing trigger times to the reader

[jose-luis-rs]

The TAMEX trigger trailing edge was added to the LOS Reader, this should cover the PR #989 by @lponnath

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Checklist:

• [x] Rebased against dev branch
• [x] My name is in the resp. CONTRIBUTORS/AUTHORS file
• [x] Followed the pull request guidlines and the Git workflow
• [x] Followed the seven rules of great commit messages