Fix infinite recursion in ensureStringed(Array)

To ensureStringed(thing), you must first ensureStringed(thing)...
This was causing an infintel loop in multidevice mode.

js/helpers.js

@@ -139,7 +139,7 @@ function ensureStringed(thing) {
 	else if (thing instanceof Array) {
 		var res = [];
 		for (var i = 0; i < thing.length; i++)
-			res[i] = ensureStringed(thing);
+			res[i] = ensureStringed(thing[i]);
 		return res;
 	} else if (thing === Object(thing)) {
 		var res = {};

js/options.js

@@ -22,7 +22,7 @@ $('#number').on('change', function() {//TODO
 		$('#number').attr('style', '');
 });
 
-var single_device = true;
+var single_device = false;
 var signaling_key = getRandomBytes(32 + 20);
 var password = btoa(getRandomBytes(16));
 password = password.substring(0, password.length - 2);