Fix double display of search windows in command-line scripts

Running

$ raven_query --help

shows for the window argument

 -w tl th tl th, --window tl th tl th
                        Time window [tl, th] seconds to search around event time (required with th > th)

double displaying the arguments. This should be fixed to

 -w tl th, --window tl th
                        Time window [tl, th] seconds to search around event time (required with th > th)

or some equivalent.