action-list.js: Update the history explicitly when closing col2

With Icinga/icingaweb2#5179 this will
not be done by default anymore

public/js/action-list.js

@@ -126,6 +126,7 @@
                 && _this.icinga.loader.getLinkTargetFor($(target)).attr('id') === 'col2'
             ) {
                 _this.icinga.ui.layout1col();
+                _this.icinga.history.pushCurrentState();
                 _this.enableAutoRefresh('col1');
                 return;
             }