Change plus2 to minus2 in PSDstart offset calculation
Description
@soichiro.morisaki noticed that the GPSstart times (for fetching data) were set after the PSDstart time in LALInference_pipe when enabling the 'in-pipeline' use of BayesWave to compute PSDs. This is fixed by changing the line in this MR to set the PSDstart to be seglen-2s offset from trigtime, instead of seglen+2 as it had been previously.
API Changes and Justification
Backwards Compatible Changes
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This change introduces no API changes -
This change adds new API calls
Backwards Incompatible Changes
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This change modifies an existing API -
This change removes an existing API