gluon-status-page-api: hide warning in upgrade script

package/gluon-status-page-api/files/lib/gluon/upgrade/500-status-page-api

 #!/bin/sh
 
-uci batch <<-EOF
+uci -q batch <<-EOF
 	delete uhttpd.main.listen_http
 	add_list uhttpd.main.listen_http=0.0.0.0:80
 	add_list uhttpd.main.listen_http=[::]:80