ar71xx: correct board name to make LEDs work on RB750

Patch by: Denver A <denvera@gmail.com>
Patchwork: http://patchwork.openwrt.org/patch/3419/
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 35919

target/linux/ar71xx/base-files/etc/uci-defaults/01_leds

@@ -42,7 +42,7 @@ db120)
 	ucidef_set_led_usbdev "usb" "USB" "db120:green:usb" "1-1"
 	;;
 
-rb750)
+rb-750)
 	ucidef_set_led_default "act" "act" "rb750:green:act" "1"
 	ucidef_set_led_netdev "port1" "port1" "rb750:green:port1" "eth1"
 	ucidef_set_led_switch "port2" "port2" "rb750:green:port2" "switch0" "0x10"