closes #1559

fixes the notification image too, the property was called image not
picture

src/user/create.js

@@ -154,7 +154,7 @@ module.exports = function(User) {
 					if (userNameChanged) {
 						notifications.create({
 							text: '[[user:username_taken_workaround, ' + userData.username + ']]',
-							picture: 'brand:logo',
+							image: 'brand:logo',
 							datetime: Date.now()
 						}, function(nid) {
 							notifications.push(nid, uid);