fix(users): Default user image was causing browser errors

Even though thoroughly warned by angular docs, it seems we put an
angular expression inside the img[src] attribute. In scenarios where
angular loading is slow the browser tries to load an image at the URL
"{{::defaultUserImage}}" which obviously does not exist and causes an
error.

src/app/login/widget/loginWidget.tpl.html

@@ -14,8 +14,7 @@
            class="loginWidgetLink"
            target="_self">
             <span class="">{{profile.userName}}</span>
-            <img src="{{::defaultUserImage}}"
-                 ng-src="{{profile.imageUrls.tiny.url}}"
+            <img ng-src="{{profile.imageUrls.tiny.url || defaultUserImage}}"
                  class="loginWidgetImage">
         </a>
         <a ng-hide="loggedIn"