nginx: use new extra_command function definition

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

net/nginx/files/nginx.init

@@ -64,11 +64,8 @@ reload_service() {
 }
 
 
+extra_command "relog" "Reopen log files (without reloading)"
 relog() {
 	[ -d /var/log/nginx ] || mkdir -p /var/log/nginx
 	procd_send_signal nginx '*' USR1
 }
-
-
-EXTRA_COMMANDS="relog"
-EXTRA_HELP="	relog	Reopen log files (without reloading)"