SUP-2757, Remove scroll listener for tc-sticky directive to avoid memory leak

-- Removed event listener

Author: vikasrohit

app/directives/tc-sticky/tc-sticky.directive.js

@@ -47,6 +47,10 @@
               }
             }
           });
+          // remove the event listener before destroying the directive
+          scope.$on('$destroy',function() {
+            angular.element($window).unbind("scroll");
+          });
       }
     };
   }