rc: move job expire flags to rc to fix initalization problem

See: https://forum.rclone.org/t/rc-rc-job-expire-interval-bug/11188

rclone was ignoring the --rc-job-expire-duration and --rc-job-interval
flags.  This turned out to be an initialization order problem and was
fixed by moving those flags out of global config into rc config.

fs/rc/rcserver/rcserver.go

@@ -30,6 +30,7 @@ import (
 //
 // If the server wasn't configured the *Server returned may be nil
 func Start(opt *rc.Options) (*Server, error) {
+	jobs.SetOpt(opt) // set the defaults for jobs
 	if opt.Enabled {
 		// Serve on the DefaultServeMux so can have global registrations appear
 		s := newServer(opt, http.DefaultServeMux)