Issue 221: Return to Safety, results in going back to 403.

This is happening because of a double redirect.
When going to the `/management` page, a browser is redirected to `/management/internal-metadata`.
Then the last route ends up referring to the `/management` page, which is the route path of `/management/:tab`.
The `:tab` is not a valid part of the URL because the `$scope.lastRoute` is expected to be a path rather than a route.
Rather than rename `lastRoute` to `lastPath`:
1. Add a comment describing this behavior.
2. Wrap the assignment in a function that changes the path if any route parts are found.

app/controllers/errorPageController.js

@@ -1,5 +1,25 @@
 core.controller("ErrorPageController", function ($scope, AccessControlService) {
 
-    $scope.lastRoute = AccessControlService.getLastRoutePath();
+    $scope.getPath = function (path) {
+
+      if (!!path && path.length > 0) {
+        var paths = path.split('/');
+
+        for (var i in paths) {
+          // Return to top-level when previous path contains route variables.
+          if (paths[i][0] === ':') {
+            paths = [];
+            break;
+          }
+        }
+
+        return paths.join('/');
+      }
+
+      return path;
+    };
+
+    // This is actually a URL path and not a route.
+    $scope.lastRoute = $scope.getPath(AccessControlService.getLastRoutePath());
 
 });