Fix issue with 1024s cadence in gates

There's a bug where we apply a gate at the start and end of every segment. To fix this we should do the following:

• Set gate_edges=False in https://git.ligo.org/detchar/tools/dchgate/-/blob/main/dchgate/gate.py?ref_type=heads#L106-111
• Change https://git.ligo.org/detchar/tools/dchgate/-/blob/main/dchgate/pipe.py?ref_type=heads#L178 to the following:

known_cropped = SegmentList([Segment(gps_time_start+gate_tpad, gps_time_end-gate_tpad)]) & sci_segments
gate_list = gate_list & known_cropped