Keep "Show Upstream Dependencies" checkbox consistent on reload.

The behaviour is different on Firefox to Chrome/Safari.  For some reason firefox remembers the state of the checkbox on reload but the others reset it.  Either way, this update keeps the UI consistent.

luigi/static/visualiser/js/visualiserApp.js

@@ -352,6 +352,7 @@ function visualiserApp(luigi) {
 
     function bindListEvents() {
         $(window).on('hashchange', processHashChange);
+        invertDependencies = $('#invertCheckbox')[0].checked;
         $("#invertCheckbox").click(function() {
             invertDependencies = this.checked;
             processHashChange(true);