Improve blocking of non local urls

It was found that the original check didn't stop
http:www.google.com forwards. This fixes that issue.

Tested: Verified that the url forward didn't work

Change-Id: I44a9b84218e15ddd0d37d5fbda633b66326da1f4
Signed-off-by: James Feist <james.feist@linux.intel.com>
diff --git a/app/login/controllers/login-controller.js b/app/login/controllers/login-controller.js
index 350429b..cc0f0b3 100644
--- a/app/login/controllers/login-controller.js
+++ b/app/login/controllers/login-controller.js
@@ -42,7 +42,7 @@
               var next = $location.search().next;
               // don't allow forwarding to non-local urls
               if (next === undefined || next == null ||
-                  next.indexOf('//') >= 0) {
+                  next.indexOf(':') >= 0) {
                 $window.location.hash = '#/overview/server';
               } else {
                 $window.location.href = next;