revert: refact(): no need to trim empty hash from $location.absUrl()

This reverts commit f3b088a.

The commit didn't take into account that IE9 may actually return empty
hash URLs for $location.absUrl().

Author: petebacondarwin

src/ng/location.js

@@ -917,7 +917,7 @@ function $LocationProvider() {
     // update browser
     $rootScope.$watch(function $locationWatch() {
       var oldUrl = trimEmptyHash($browser.url());
-      var newUrl = $location.absUrl();
+      var newUrl = trimEmptyHash($location.absUrl());
       var oldState = $browser.state();
       var currentReplace = $location.$$replace;
       var urlOrStateChanged = oldUrl !== newUrl ||