ath79: fix indent in 01_leds

Change capitalization from spaces to tabs in order to match
the style of the file.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
[fix capitalization in commit title, add short description]
Signed-off-by: David Bauer <mail@david-bauer.net>

target/linux/ath79/base-files/etc/board.d/01_leds

@@ -206,8 +206,8 @@ tplink,tl-wr842n-v2)
 	ucidef_set_led_switch "lan4" "LAN4" "tp-link:green:lan4" "switch0" "0x02"
 	;;
 trendnet,tew-823dru)
-       ucidef_set_led_netdev "wan" "WAN" "trendnet:green:planet" "eth0"
-       ;;
+	ucidef_set_led_netdev "wan" "WAN" "trendnet:green:planet" "eth0"
+	;;
 ubnt,bullet-m|\
 ubnt,bullet-m-xw|\
 ubnt,nanostation-m|\