removed unused directive

public/app/core/core.ts

-import './directives/dash_class';
 import './directives/dropdown_typeahead';
 import './directives/autofill_event_fix';
 import './directives/metric_segment';

public/app/core/directives/dash_class.ts

-import $ from 'jquery';
-import _ from 'lodash';
-import coreModule from '../core_module';
-
-/** @ngInject */
-function dashClass($timeout) {
-  return {
-    link: ($scope, elem) => {
-      const body = $('body');
-
-      $scope.ctrl.dashboard.events.on('view-mode-changed', panel => {
-        console.log('view-mode-changed', panel.fullscreen);
-        if (panel.fullscreen) {
-          body.addClass('panel-in-fullscreen');
-        } else {
-          $timeout(() => {
-            body.removeClass('panel-in-fullscreen');
-          });
-        }
-      });
-
-      body.toggleClass('panel-in-fullscreen', $scope.ctrl.dashboard.meta.fullscreen === true);
-
-      $scope.$watch('ctrl.dashboardViewState.state.editview', newValue => {
-        if (newValue) {
-          elem.toggleClass('dashboard-page--settings-opening', _.isString(newValue));
-          setTimeout(() => {
-            elem.toggleClass('dashboard-page--settings-open', _.isString(newValue));
-          }, 10);
-        } else {
-          elem.removeClass('dashboard-page--settings-opening');
-          elem.removeClass('dashboard-page--settings-open');
-        }
-      });
-    },
-  };
-}
-
-coreModule.directive('dashClass', dashClass);