gluon-setup-mode: change START to 15

To start after haveged after the recent update.

package/gluon-setup-mode/files/etc/init.d/gluon-setup-mode

@@ -1,6 +1,6 @@
 #!/bin/sh /etc/rc.common
 
-START=12
+START=15
 
 
 SETUP_MODE_ADDR=192.168.1.1