refactor($anchorScrollSpec): remove unused variable

Author: gkalpak

test/ng/anchorScrollSpec.js

@@ -90,7 +90,6 @@ describe('$anchorScroll', function() {
     };
 
     docSpies = {};
-    var i = 0;
 
     return function($rootScope, $window) {
       var propsToMock = ['body', 'documentElement'];