ATOF timing window should be around 0

[N-Plx]

In the latest timelines, the time/fit range for the ATOF is between ~84-94 but should be centered around 0 with our new calibrations
https://clas12mon.jlab.org/rgl/pass0_v9/alert/timeline/

[N-Plx]

@zhiwanxu @Sangbaek

[zhiwanxu]

created new branch: atof-window-26