procd: fix command handling in procd_add_instance()

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 38350

package/system/procd/files/procd.sh

@@ -193,7 +193,7 @@ _procd_close_trigger() {
 
 _procd_add_instance() {
 	_procd_open_instance
-	_procd_set_command "$@"
+	_procd_set_param command "$@"
 	_procd_close_instance
 }