initialize new pin arrays

wled00/data/settings_um.htm

@@ -10,6 +10,8 @@
 	d.um_p = [];
 	d.rsvd = [];
 	d.ro_gpio = [];
+	d.h_pins = [];
+	d.x_pins = [];
 	var umCfg = {};
 	var pins = [], pinO = [], owner;
 	var loc = false, locip;