Fix RAVEN time windows

ensuring correct time windows are called for the different searches:

New LVAlert	Search for	Search window (s)	Physical scenario	Implemented
CBC Superevent	GRB	[-1, 5]	BNS followed by sGRB	Y
GRB	CBC Superevent	[-5, 1]	BNS followed by sGRB	Y
Burst Superevent	GRB	[-60, 600]	CCSN followed by long GRB	Y
GRB	Burst Superevent	[-600, 60]	CCSN followed by long GRB	Y
Burst Superevent	SNEWS	[-10, 10]	CCSN	Y
SNEWS	Burst Superevent	[-10, 10]	CCSN	Y
CBC Superevent	SNEWS	[-10, 10]	?	N
SNEWS	CBC Superevent	[-10, 10]	?	N