xfrpc: set xfrpc's disabled default value to 0

change this to satisfy luci-app-xfrpc's need

Signed-off-by: Dengfeng Liu <liudf0716@gmail.com>
(cherry picked from commit 10a24d4cad)

net/xfrpc/files/xfrpc.init

@@ -64,7 +64,7 @@ start_service() {
 	config_load "$NAME"
 
 	uci_validate_section xfrpc xfrp init \
-			'disabled:bool:1' \
+			'disabled:bool:0' \
 			'loglevel:uinteger:0'
 
 	if [ $disabled = 1 ]; then