bug in `apply_gti_filter` parameter of Readevent

when using this parameter ``apply_gti_filter::Bool = false`: Filter events using GTI` in readevent
It was removing all the events when we use this parameter with `convert_to_mjd=true`

<img width="1017" height="96" alt="Image" src="https://github.com/user-attachments/assets/b2c7bd85-0f18-4c98-a688-0b9922980f58" />

