EOD Called Twice

[CormacRoss]

With the following config to save down at 17:10 EST, eod gets called twice when EST clocks change in Autumn:

.eodtime.rolltimeoffset:-0D06:50:00.000000000
.eodtime.rolltimezone:`$"America/New_York"

Specific example:

1. On Saturday 2020.10.31 save down happens correctly and as expected at 21.10 UCT (17.10 EST)

2. The next EOD gets scheduled for 2020.11.01D21:10:00.000000000:
q)p:2020.10.31D21:10:01.000000000
q)z:.eodtime.rolltimeoffset-exec adjustment from .tz.t asof `timezoneID`gmtDateTime!(.eodtime.rolltimezone;p)                          
q)z:`timespan$(mod) . "j"$z, 1D
q)("d"$p) + $[z <= p;z+1D;z]                             
2020.11.01D21:10:00.000000000

3. Overnight the clocks go back one hour

4. On Sunday EOD is incorrectly called one hour early at 21.10 UTC (16:10 EST)

5. The next EOD is scheduled 1 hour later for 2020.11.01D22:10:00.000000000 (17:10 EST)
q)p:2020.11.01D21:10:01.000000000
q)z:.eodtime.rolltimeoffset-exec adjustment from .tz.t asof `timezoneID`gmtDateTime!(.eodtime.rolltimezone;p)                          
q)z:`timespan$(mod) . "j"$z, 1D
q)("d"$p) + $[z <= p;z+1D;z] 
2020.11.01D22:10:00.000000000