bisync: fix dryRun rc parameter being ignored

Before this change, bisync ignored the dryRun parameter (only when specified
via the rc.)

This change fixes the issue, so that the dryRun rc parameter is equivalent to
the --dry-run flag.

cmd/bisync/rc.go

@@ -26,6 +26,7 @@ func rcBisync(ctx context.Context, in rc.Params) (out rc.Params, err error) {
 
 	if dryRun, err := in.GetBool("dryRun"); err == nil {
 		ci.DryRun = dryRun
+		opt.DryRun = dryRun
 	} else if rc.NotErrParamNotFound(err) {
 		return nil, err
 	}